1. Solution problems

2. If we dissolve 87 grams of silver into 200 grams of gold, the resulting alloy is what percent silver?

3. 87g / 287 grams = 0.303 = 30.3%

4. A sample of stainless steel is 17% chromium. How many grams of chromium would be present in a 465 g mass of this stainless steel?

5. 465g x.17 = 79.05g

6. 14 grams of sugar are dissolved in to 165 mL of water. The resulting solution is what percent sugar?

7. 14g / 165 mL = 0.085 =8.5%

8. 160 mL of a 2.5% salt solution would have how many grams of salt?

9. 160 mL x.025 = 4 g

10. – 37 mL of vinegar are dissolved into 150 mL of water. The resulting solution is what percent vinegar?

11. – 37 mL / 187 mL =.198 = 19.8%

12. How many mL of vinegar are required to make 500 mL of a 20% solution of vinegar?

13. 500 mL x 0.2 = 100 mL

14. If 2 moles of salt are dissolved into 150 mL of water, what is the molarity of the resulting solution?

15. Remember Molarity = M M = moles solute / Liter solution  2 mol  150 mL =.15 L  2mol /.15 L = 13.3 M

16. If 37 grams of KOH are dissolved into 500 mL of water, what is the molarity?

17.  37 g / (56 g/mol) = 0.66 mol  500 mL = 0.5 L  0.66 mol / 0.5 L = 1.32M

18. How many grams of NaOH are required to make 125 mL of a 2.6 M solution?

19. 2.6 mol / 1 L = x mol / 0.125 L; x =.325 mol 0.325 mol x (40 g/mol) = 13 g

20. For a “how many grams problem” (M) x (V in Liters) x (molar mass) = grams