Chemistry help?

Question

Calculate the pH of a solu$on made by mixing 100.0 mL of a 0.100 M solu$on of ace$c acid (HC2H3O2), which has a Ka value of 1.8 × 10–5, and 50.0 mL of a 0.10 M NaOH solu$on. 

 

Answer 1

Step 1:

The concentration of acetic acid is 0.1 M for 100 mL.

The concentration of sodium hydroxide is 0.1 M for 50 mL.

k_a for acetic acid is .

First find the amount of acid left after reaction.

Number of moles of acetic acid : .

Number of moles of sodium hydroxide : .

Number of moles of acid left after reaction : .

Now find the concentration of base and acid after reaction.

Now total volume : .

Concentration of Base : .

Concentration of Acid: .

Step 2:

Definition of pH :

pH of the solution is 4.4436.

Solution:

pH of the solution is 4.4436.