ACID, BASE & SALT
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https://youtu.be/vru42bcwk6U Acids are hydrogen-containing substances with a sour taste that form solutions with pH values less than 7. Common examples include hydrochloric acid. base is a chemical species that releases hydroxide (OH-) ions in aqueous solution.Common examples include sodium hydroxide. Salt is a neutral substance. alkaline solutions turn red litmus blue and acid solutions turn blue litmus red. Fermentation in food processing is the process of converting carbohydrates to alcohol or organic acids using microorganisms such as yeasts or bacteria under anaerobic conditions.
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Acid , bases and salt
ACID, BASES AND SALTS DETAILED EXPLANATION. ANYONE CAN UNDERSTAND IT COMPLETELY. VERY HELPFUL FOR STUDENTS
Acid and bases
This document discusses acids and bases, both in the laboratory and household settings. It describes how acids and bases can be measured on the pH scale using indicators and provides examples of common acids and bases found at home. Finally, it provides instructions for making a homemade pH indicator using red cabbage and testing various household substances to determine whether they are acidic or basic.
Acid and bases and salts
There are two main types of acids: organic acids which are obtained from plants and animals, and mineral acids which are derived from inorganic materials. Acids and bases can be classified as strong or weak based on their corrosive properties and reaction behavior. A neutralization reaction occurs when an acid and base react to form a salt and water, resulting in a neutral solution. Neutralization reactions have many applications, including treating ant stings, indigestion, soil acidity, sewage waste, and protecting teeth. Indicators like litmus paper and natural dyes can be used to determine whether a solution is acidic, basic, or neutral.
Class 7 chapter 5 Acids ,bases and salts ppt 1
This document discusses acids, bases, and indicators. It provides examples of natural acids and bases commonly used in daily life. It explains that indicators are substances used to determine if a substance is acidic or basic by changing color when added. Examples of natural indicators discussed include litmus, turmeric, and china rose. Litmus extracted from lichens changes color from mauve to red in acids and blue in bases. Turmeric and soaked china rose petals also change color when added to acids versus bases.
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This presentation discusses acids, bases and salts. It defines acids as sour substances that turn litmus red, and lists common examples like citric acid. Bases are defined as bitter substances that turn litmus blue, with examples like sodium hydroxide. Common acids found in foods like vinegar, citrus fruits, and curd are identified. Indicators are substances that change color in acids and bases, and examples like litmus paper and turmeric are described. Neutralization reactions between acids and bases are covered, noting they produce heat and a salt. An activity is presented testing different solutions with indicators like litmus and china rose to identify them as acidic or basic.
Chemistry project 1
Max Mario conducted a chemistry project to determine the contents of different cold drink brands. He tested samples of Thumbs Up, Fanta, and Maaza for pH, carbon dioxide, glucose, phosphate, alcohol, and sucrose. The results showed that the drinks varied in their acidic levels and presence of components like phosphate and alcohol. While all contained carbon dioxide, glucose, and sucrose, only Fanta and Maaza tested positive for alcohol and Thumbs Up was the only one containing phosphate. The project concluded with discussing both the uses and disadvantages of consuming cold drinks regularly.
ACIDS BASES AND SALTS
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Acid , bases and salt
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This document discusses acids and bases, both in the laboratory and household settings. It describes how acids and bases can be measured on the pH scale using indicators and provides examples of common acids and bases found at home. Finally, it provides instructions for making a homemade pH indicator using red cabbage and testing various household substances to determine whether they are acidic or basic.
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There are two main types of acids: organic acids which are obtained from plants and animals, and mineral acids which are derived from inorganic materials. Acids and bases can be classified as strong or weak based on their corrosive properties and reaction behavior. A neutralization reaction occurs when an acid and base react to form a salt and water, resulting in a neutral solution. Neutralization reactions have many applications, including treating ant stings, indigestion, soil acidity, sewage waste, and protecting teeth. Indicators like litmus paper and natural dyes can be used to determine whether a solution is acidic, basic, or neutral.
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This presentation discusses acids, bases and salts. It defines acids as sour substances that turn litmus red, and lists common examples like citric acid. Bases are defined as bitter substances that turn litmus blue, with examples like sodium hydroxide. Common acids found in foods like vinegar, citrus fruits, and curd are identified. Indicators are substances that change color in acids and bases, and examples like litmus paper and turmeric are described. Neutralization reactions between acids and bases are covered, noting they produce heat and a salt. An activity is presented testing different solutions with indicators like litmus and china rose to identify them as acidic or basic.
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This document is a chapter from a Class VII science textbook about acids, bases, and salts. It provides explanations and examples of acids and bases, including how they can be identified using natural indicators like litmus, turmeric, and china rose. It also discusses neutralization reactions, acid rain, and applications of acids and bases in everyday life like antacids and soil treatment. Sample questions are provided at the end for students to test their understanding.
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This document describes an experiment to create a pH indicator using red cabbage. Red cabbage is boiled to extract pigments, then droplets of the cabbage solution are added to test tubes containing acidic, alkaline, and neutral solutions. The cabbage solution turns yellow in acid, pink in alkaline solution, and light purple in neutral solution, showing it can indicate the pH of different solutions. The conclusion states this is an easy way to test if water sources are acidic or alkaline, and it would be interesting to test other natural products as pH indicators besides just red cabbage and beetroot.
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- Red cabbage contains the pigment anthocyanin, which can be used as a natural pH indicator. Boiling and steeping cabbage produces a purple liquid that changes color in acidic and basic solutions.
- When the cabbage indicator solution is added to lemon juice, vinegar, or other acids, it turns red or purple, indicating an acidic pH below 7. When added to bleach, a strong base, it turns greenish-yellow, showing a basic pH above 7.
- The color change occurs because the anthocyanin pigment absorbs and reflects different wavelengths of light depending on whether the solution is acidic or basic, based on its hydrogen ion concentration.
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The document discusses acids, bases and indicators. It explains that acids taste sour and turn litmus paper red, while bases taste bitter and feel soapy, and turn litmus paper blue. Indicators are substances that change color in acidic and basic solutions, and can be used to test if a substance is acidic or basic. It also describes the process of neutralization, where an acid and base react to form a salt and water, with heat released. Examples of natural indicators like litmus, turmeric and china rose are given, along with their color changes in acid and bases.
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This experiment aims to make pH indicators from red cabbage and turmeric extracts and use them to test the pH of various household chemicals. Red cabbage extract changes color from pink in acidic solutions to purple and green in neutral and basic solutions respectively. Turmeric extract is yellow below pH 7.4 and red above pH 8.6. Using the indicators, vinegar and orange juice were found to be acidic, while toothpaste was found to be basic.
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This experiment aims to make a pH meter and buffer solution. Red cabbage and turmeric extracts were tested as natural pH indicators. Red cabbage juice turns red in acid and purple/blue in neutral/base. Turmeric is yellow below pH 7.4 and pink/red above pH 8.6. Household products like vinegar, orange juice, and toothpaste were found to be acidic, acidic, and basic respectively when tested with the indicators. Both red cabbage and turmeric indicators can distinguish acid from base, with red cabbage having a wider detectable pH range.
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This document discusses acids, bases, and salts. It begins by explaining the nature of metal and non-metal oxides and the reactions of acids and bases with metal carbonates and hydrogen carbonates. It then discusses the reactions of acids and bases with each other and the strengths of acids and bases. A key point is that the strength of an acid or base depends on the concentration of hydrogen or hydroxide ions. It also explains that pH measures acidity or alkalinity on a scale of 0-14 and discusses the importance of pH in everyday life such as digestion and plant growth. Examples of uses of acids, bases and salts are also provided.
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This experiment aims to make a pH meter and buffer solution. Red cabbage and turmeric extracts were tested as natural pH indicators. Red cabbage juice turns from red in acid to purple to green-yellow in base. Turmeric is yellow below pH 7.4 and pink above 8.6. Household products like vinegar, orange juice, and toothpaste were found to be respectively acid, acid, and base when tested with the indicators. Both red cabbage and turmeric can act as pH indicators but red cabbage maintains its colors longer.
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This document provides an introduction to acids, bases and indicators for a 7th grade class. It defines acids and bases, explains how indicators like litmus paper and china rose petals can show if a substance is acidic or basic, and demonstrates the neutralization reaction between an acid and base to form salt and water. Examples of neutralization in everyday life include using antacids for indigestion and baking soda for ant bites.
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This experiment aims to make pH indicators from red cabbage and turmeric extracts and use them to test the pH of various household chemicals. Red cabbage extract changes color from pink in acidic solutions to purple and green in neutral and basic solutions respectively. Turmeric extract is yellow below pH 7.4 and red above pH 8.6. Using the indicators, vinegar and orange juice were found to be acidic, while toothpaste was found to be basic.
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REASIGNACION 2024 UGEL CHUPACA 2024 UGEL CHUPACA.pdf
ACID, BASE & SALT
- 1. ACID, BASE & SALT By DANAPRIYA https://youtu.be/vru42bcwk6U
- 2. A student prepared solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since, both the solutions are colorless, how will she distinguish between the two?
- 3. Add phenolphthalein to a portion of each solution in separate test tube. If it turns pink, the beaker contains base whereas if it remains colorless, it is an acid. If phenolphthalein is not available, pH paper can be used. Acid will turn pH paper red, base will turn pH paper blue.
- 4. Explain how antacid works. Hyperacidity is caused by excess of hydrochloric acid in stomach. Antacid is basic in nature. It neutralizes excess of acid and gives relief from pain caused by hyperacidity. magnesium hydroxide. calcium carbonate.
- 5. Tap water conducts electricity where as distilled water does not. Tap water contains ions which conduct electricity, distilled water does not contain ions.
- 6. For a dilution of acid, acid is added into water and not water into acid. Adding water to acid is highly exothermic. Therefore water is added to acid very slowly with cooling.
- 7. During summer season, a milk man usually adds a very small amount of baking soda to fresh milk. Baking soda does not allow milk to change to lactic acid which makes milk sour.