An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis).
A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts.
Salt is a chemical compound consisting of an ionic assembly of cations and anions.
Tabla de Ka y pKa nos muestra acidos con sus respectivas constantes de acides y pka's. En la tabla se ve el nombre del acido, su formula quimica, su acido conjugado su base conjugada, y la fuerza de estos.
19.1 acids, base and salts By Hamdy KarimHamdy Karim
Students will be able to compare between Arrhenius, Bronsted-Lowry, and Lewis theories to identify the acids and bases concept. They also will study the conjugated acids and bases in addition to the Amphoteric Substances as well!
An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis).
A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts.
Salt is a chemical compound consisting of an ionic assembly of cations and anions.
Tabla de Ka y pKa nos muestra acidos con sus respectivas constantes de acides y pka's. En la tabla se ve el nombre del acido, su formula quimica, su acido conjugado su base conjugada, y la fuerza de estos.
19.1 acids, base and salts By Hamdy KarimHamdy Karim
Students will be able to compare between Arrhenius, Bronsted-Lowry, and Lewis theories to identify the acids and bases concept. They also will study the conjugated acids and bases in addition to the Amphoteric Substances as well!
8 Killer Project-Based Student Challenges in Earth ScienceIT'S ABOUT TIME®
QUESTION: Why do geoscientists have the coolest careers on the planet and how can teachers prepare students for it? ANSWER: http://bit.ly/geoscience
EarthComm® is a comprehensive, project-based, secondary level Earth and space sciences program. It includes student learning materials, teacher resources, teacher-support networks, and assessment tools. EarthComm also features a robust Web site filled with student and teacher resources regularly updated by AGI.
EarthComm® promotes systems thinking.
In EarthComm®, students learn about the interactions among the various parts of the Earth system by reflecting on the ways in which matter and energy flow through the Earth system, and the different ways in which Earth’s processes occur over time and space.
EarthComm® fosters Earth stewardship.
With EarthComm®, students discover the wonder and importance of Earth and space science by studying it where it counts—in their community. EarthComm® utilizes local and regional issues and concerns to stimulate problem-solving activities, and to foster a sense of Earth stewardship by students in their communities.
1. Colegio San Patricio
Name ____________________________________________ Date _____________
ACIDS AND BASES
WORKSHEET
1.- Identify the following properties as : acid or base or both
a) taste sour b) feel slippery
c) turn litmus paper to blue c) react with metals to produce H2
d) dissolve in water e) taste bitter
f) release H ions g) turn litmus paper to red
h) react with carbonates to produce CO2 gas i) burn skin
j) proton donor k) release OH ions
l) conduct electricity
2.- Classify the following as acid or base
H3PO4 HCl Mg(OH)2 HClO3 KOH
Al(OH)3 HNO3 NaOH H2SO4 HBr
HCN LiOH H2SO3 HF HC2H3O2
3.- Classify the following acids(weak or strong) or bases ( weak or strong)
a) HCl b) HC2H3O2 c) NH3
d) NaOH e) H2SO4 f) HNO3
4.- Why do people store acids in glass containers and not in metallic containers?
5.- What must never be done to test an acid or base?
6.- What must be done if a strong acid or base spills on your skin?
7.- Would a dilute solution of ammonia be harmful? Explain.
8.- Would a dilute solution of hydrochloric acid be harmful? Explain.
Colegio San Patricio
2. Name ____________________________________________ Date _____________
MEASURING ACIDITY
1.- What does a substance’s pH tell you?
2.- Draw the pH scale and label the acid , neutral and base areas
3.- Classify the following substances as : Very acidic, moderately acidic, slightly
acidic, neutral …….
a) vinegar pH = 2 b) blood pH = 7.4
c) milk pH = 6.5 d) drain cleaner pH = 12
e) sea water pH = 8.5 e) soap pH = 9
4.- What methods are used to measure pH?
5.- Fill in with the symbols > , < or =
a) For acidic solutions, the [H] is ________ than 1x10 -7
b) For basic solutions, the [H] is _________ than 1 x 10 -7
c) For neutral solutions, the [H] is _________ to 1 x 10 -7
d) For neutral solution, the [H] ______ [OH]
e) For acidic solutions, the [H] ______[OH]
f) For basic solutions, the [H] _______[OH]
6.- Why is universal indicator (pH paper) a better indicator to use than litmus paper?
7.- What is a disadvantage of using indicators to measure pH?
8.- What color would HCl turn red cabbage juice? _________
And NaOH? _____________
9.- If a solution turns litmus paper to red it would be an acid or base? _________
10.- If a solutions turns red cabbage juice to yellow, it would be an acid or base? _____
11.- Classify the following substances as acidic, basic or neutral
a) windex pH = 10 b) aspirin pH = 3 c) bleach pH = 13
d) shampoo pH = 6 e) lemon juice pH = 2 f) egg pH = 8