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Answer 1 · 2017-02-26T02:19:58

The experimental value of $M_"B"$ will be greater than the true value.

Assume that the reaction is

$"acid + base → salt + water"$

Then you have

$M_"A"V_"A" = V_"B"M_"B"$

and

$M_"B" = (M_"A"V_"A")/V_"B" = M_"A"/V_"B" × V_"A" = "constant" × V_"A"$

If $V_"A"$ is the true value, then $M_"B"$ will be the true value.

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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 $V_"A"$ will be too large, so your calculated value of $M_"B"$ will also be too large.