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# Molarity, temp, solubility

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### Molarity, temp, solubility

1. 1. At 30 *C, how manygrams of HCl will beneeded to saturate 100grams of water?About 66 grams
2. 2. At 70 degrees, you havedissolved 55 grams ofNH4Cl in 100 grams ofwater. Is the solutionunsaturated, saturatedor supersaturated? UNSATURATED , just barely, but dang close to saturated!!!!!
3. 3. At 70 degrees, you havedissolved 61 grams ofNH4Cl in 100 grams ofwater. Is the solutionunsaturated, saturatedor supersaturated? saturated!!!!!
4. 4. At 90 degrees, you havedissolved 90 grams ofNH4Cl in 100 grams ofwater. Is the solutionunsaturated, saturatedor supersaturated? SUPER- SATURATED!
5. 5. By using the solubilityproperties of gases andsolids, is NH3 a gas orsolid? GAS How do we know?Since the solubility goesdown as temperature goesup, it has to be a gas!
6. 6. How much sodiumnitrate will dissolve in100 grams of water at50 deg C? 114 gramsIf you decrease thetemperature of the lastsolution to 10 deg C,how many grams ofsodium nitrate should“precipitate” from thesolution? 114-80= 34
7. 7. • A dilute solution is one in which the amount of solute dissolved is small in relation to the amount of solvent.• A concentrated solution is one in which a relatively large amount of solute is dissolved.So, can a dilute solution be a saturated solution also?? YEP.
8. 8. MOLARITY – The molarity of asolution is a measurement of the__________ of the solution. The concentrationunits used to measure molarity are MOLES LITER_________ per _________ . Thesymbol we use is the capital letter M_____ .
9. 9. Calculate the molarity of a solution which is made by dissolving 50 gramssodium hydroxide in water to make 125 mL of solution. 50 grams 1 mole Moles 1000 mL = 10 ______ Liter 125 mL 40 grams 1 Liter Remember, we say the answer is 10M
10. 10. You have 20 grams of sodium hydroxide.Your goal is to make a 2.0M solution usingALL of your sodium hydroxide. How muchsolution will you have when you are done? LITER 1 MOLE 20 grams 2.0 = .25 L 40 grams MOLES I could also ask for the answer in mL (then answer is 250mL)