Question

Given 20 mL NaOH; 0.1 M, add 0.05 M HCl, 10 mL at a time.
What is the pH initially of NaOH?
What is the pH after adding 10 mL 0.05 M HCl?
What is the pH after adding 20 mL 0.05 M HCl?
What is the pH after adding 30 mL 0.05 M HCl?
What is the pH after adding 40 mL 0.05 M HCl?
What is the pH after adding 50 mL 0.05 M HCl?
What is the pH at equivalence point?

Answer 1

This is the equivalent of an afternoon's work. What do you not understand about this and I can help you through it. The secret to this problem is to recognize what you have in the solution. For example, to start, you have a solution of NaOH, 0.1 M so the pOH is 1 and pH = 13.

Answer 2

a (s) is obtained by mixing 25ml of 0.5 mol/l HCl and 25ml of 0.5 mol/l H2SO4 solution is titrated with 93.75ml of barium hydroxide solution

1-write the ionic eq.
2- calculate C
3. determine mass of barium sulfate obtained:P
*molar masses: Ba=137
S=32 O=16