To make an effective buffer, 25.00 ml of 0.025 m hf should be mixed with of 0.050 m naoh

The volume of NaOH will be, 12.5 mL

Explanation:

To calculate the volume of base, we use the equation given by neutralization reaction:

where,

are the n-factor, molarity and volume of acid which is

are the n-factor, molarity and volume of base which is NaOH.

We are given:

Putting values in above equation, we get:

Hence, the volume of NaOH will be, 12.5 mL

it would be a gas formation