Finding the molarity of a solution and finding the pH of a

Finding the molarity of a solution and finding the pH of a

Hi, I’m having a lot of trouble figuring out how to do these questions. PLEASE HELP!!!
Question 1. A Solution X is made by taking 10.00 mL of a 1.0 M solution and add enough water to make 100.0 mL total volume. Solution Y is made by taking 5.0 mL of solution X and diluting it again by adding it to 95 mL of water.
a) What is the molarity of Solution X?
b)What is the molarity of solution Y?
Question 2. Calculate the molarity of the solution created when 50.0 mL of 0.132 M NaOH is mixed with 75.0 mL of 0.120 M NaOH (assuming that volumes are additive).
Question 3. If a solution has a measured concentration of OH- of 1.20×10-4 M, what is the pH of this solution?

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