Suppose the concentration of the NaOH solution was 0.5 M instead of 0.1 M. Would this titration have required more, less, or the same amount of NaOH solution for a complete reaction? Explain

The titration will require a less amount of the NaOH solution.

I will like to state here that the amount we are talking about is the volume of the NaOH solution.

Concentration is defined as mole per unit volume i.e

We can see from the formula above that the concentration is inversely proportional to the volume.

This means that a higher concentration requires a lower volume and a lesser concentration requires a higher volume.

Therefore, we can conclude that the titration will require a less amount (i.e volume) of the 0.5 M NaOH solution.

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Less.

Explanation:

Since there was an increase of concentration of NaOH, there would be more molecules of NaOH present. There would be no need to use the same amount of NaOH because there was already more in the solution.