1) What is the pH value of 50ml of 0.01M of H2CO3? Ka1= 4.3*10^-7, Ka2= 5.6*10^-

Question

1) What is the pH value of 50ml of 0.01M of H2CO3? Ka1= 4.3*10^-7, Ka2= 5.6*10^-11

2) what is the pH if 10ml of 0.01M of NaOH is added into the solution in (1)?

3) what is the pH if 50ml 0.01M of NaOH is added into the solution in (1)?

4) what is the pH if 75ml 0.01M of NaOH is added into the solution in (1)?

5) what is the pH if 100ml 0.01M of NaOH is added into the solution in (1)?

6) what is the pH if 125ml 0.01M of NaOH is added into the solution in (1)?

7) a solution contains 0.2M of [Ba2+] and 0.01M of [Cd3+]. if Na2CO3 is added into the solution, what is the concentration of [Cd3+] when [Ba2+] starts precipitated out?
Ksp of BaCO3 is 2.58x10^-9, Ksp of CdCO3 is 1.0x10^-12

Explanation / Answer

1. 4.5 2. 6.3 3. 5.8 4. 6.9

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