# Question #84fcd

Feb 26, 2017

The experimental value of ${M}_{\text{B}}$ will be greater than the true value.

#### Explanation:

Assume that the reaction is

$\text{acid + base → salt + water}$

Then you have

${M}_{\text{A"V_"A" = V_"B"M_"B}}$

and

${M}_{\text{B" = (M_"A"V_"A")/V_"B" = M_"A"/V_"B" × V_"A" = "constant" × V_"A}}$

If ${V}_{\text{A}}$ is the true value, then ${M}_{\text{B}}$ will be the true value.

If there is a bubble in the buret tip, as in the picture above, you will think that you have added more acid than the true value.

Your value of ${V}_{\text{A}}$ will be too large, so your calculated value of ${M}_{\text{B}}$ will also be too large.