Question

1. If you diluted a solution with a pH of 3 the following way, what would the pH be?
   1. 1 ml in 9ml
   2. 1 ml in 9ml
   3. 1 ml in 99ml

Answer 1

The concentration of the solution with pH = 3 is 0.001N

a. When 1ml of the solution is added to 9ml of water, the concentration of the solution can be calculated by 0.001*1/10 = 0.0001 , where 0.001N is the concentration of original solution      1ml is the amount of solution diluted 10ml is the total amount of new solution (1ml of solution + 9ml of water)

pH of the diluted solution is -log(0.0001) = 4

c. When 1ml of the solution is added to 99ml of water, the concentration of the solution can be calculated by 0.001*1/100 = 0.00001 , where 0.001N is the concentration of original solution 1ml is the amount of solution diluted 100ml is the total amount of new solution (1ml of solution + 99ml of water)

pH of the diluted solution is -log(0.00001) = 5