Chemistry problems: Concentration and electrolytes

CHE 100 Preparatory Chemistry

Question:

1.CaBr2 is an electrolyte.

Ca has a ………… charge. 1 mole of CaBr2 contributes ………… equivalents from the calcium ion.

Br has a 1- charge. 1 mole of CaBr2 contributes …………………… equivalents from the bromine ions. 1 mole of CaBr2 contributes equivalents in total.

2. The molar mass of benzoic acid is 122.12 g/mole. A solution contains 3.4 grams of Benzoic acid dissolved in 2 liters of water. What is the molarity of this solution?

3. 5 g of sugar is dissolved in 1 L of water. What is the concentration of the solution in mass volume percent (m/v)?

4. 100 mL of isopropanol is mixed with 400mL of water. What is the concentration of the solution in volume percent?

5. 6g of vitamin C is dissolved in a 200g solution. What is the concentration of the solution in mass percent?

6. I have a 3M stock solution of NaOH. If I dilute 25 mL of the 3M stock solution to 1 L. What is the concentration of the diluted solution.

7. A. The chia seeds in my smoothie are very large and visible in my smoothie. The chia seeds form a [ Select ] ["suspension", "solution", "colloid"] with the water in my smoothie.

b. The fruit in my smoothie will settle to the bottom. The fruit [ Select ] ["does", "does not"] form a solution with the rest of the smoothie.

c. The very large proteins in from the milk my smoothie form a [ Select ] ["suspension", "solution", "colloid"] with the water in my smoothie.

d. The small fructose molecules form a [ Select ] ["suspension", "solution", "colloid"] with the water in my smoothie.

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