from a 100mL prepared buffer, only 20mL was used for the addition of a strong acid or base. will the taken 20mL still represents the same moles as the originally prepared buffer solution?

Question

Will the moles of the obtained 20mL buffer from the originally prepared 100mL buffered solution have the same moles or will they be different? What I am sure of is that the concentration of the 2 solutiom remains the same.

Answer 1

Hello, Airah,

The 20 ml sample will have the same concentration, e.g., Molar, as you point out. But the number of moles of the buffer is dependent on the volume. Moles = volume x concentration. 20 ml represents 20% of the original number of moles in the 100 ml buffer.

Bob