Answers to the Acids, Bases, and Solutions Worksheet

1. Catherine dissolves a quantity of KCl into 238 g of water. She attempts to calculate the concentration when she realizes that she forgot to record the mass of the KCl. To determine the concentration of the unknown solution she decides to take 125 g of the solution and evaporate it to dryness. When the water is evaporated the residue is weighed and found to have a mass of 2.20 g. What is the percent concentration of this solution?
   
   
2. 6.20 g of Na₂S is dissolved in enough water to prepare 325 mL of solution. What is the molarity of this solution?
   
   
3. 2.50 mL of the solution in Question 2., above, is diluted to 50.0 mL. What is the molarity of this dilute solution?
   
   
   
4. What mass of zinc is required to fully react with 8.00 g of a 6.0% HCl solution?
   
   
5. What volume of 3.0 M nitric acid is required to prepare 250 mL of a 0.15 M solution?
   
   
6. You are given two NaOH samples, A and B, and asked to determine which is more concentrated. 10.00 mL of sample A required 22.0 mL of 0.1000 M HCl to neutralize the NaOH, and 10.00 mL of solution B required 48.0 mL of 0.1000M HCl to neutralize the NaOH. Which solution is more concentrated, A or B? Explain your answer.
   
   

    

7. What is the [OH^-] of a 2.0 M NaOH solution?
8. What is the [H⁺] of a 2.0 M NaOH solution?
   
   
9. What is the [OH^-] for a solution with a pH of 8.0?
10. What is the [H⁺] for a solution with a pH of 8.0?
    
    
     
11. What is the [H⁺] of a 0.050 M HBr solution?
12. What is the [OH^-] of a 0.050 M HBr solution?
    
    
13. What is the pH of a 0.050 M HBr solution?
    
    
     
14. 20.0 mL of a 3.0M HCl solution are mixed with 20.0 mL of a 5.0M NaOH solution. Is the pH of the resulting solution above 7, below 7, or 7? Explain your answer.
    
    
15. 6.2 mL of a 6.0M solution of KOH is diluted to 50.0 mL. What is the pH of the dilute solution?
    
    
16. How many mL of a 0.345M phosphoric acid solution are required to neutralize 125 mL of a 0.123M KOH solution?
    
    
17. 12.3 g of NaOH are dissolved in enough water to prepare 1555 mL of solution. What is the pH of this solution?
    
    
18. How many mL of a solution with a pH of 0.50 would it take to neutralize 16.0 mL of a 0.100M LiOH solution?
    
    
19. How many g of water in 2.08 lb of an 8.0% m/m sugar solution?
    
    
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20. How many mL of 2.0 M HCl are required to react with 3.0 g of Al?