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the student performed a second trial and accidentally added more sodium hydroxide to the flask than was needed to reach the end point but recorded the final volume. would this error increase, decrease or have no effect on the calculated acid concentration for the second trial?

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A greater volume of acid will be needed to neutralize the sodium hydroxide thereby making the calculated concentration of acid for the second trial to decrease.

Titration is usually a way of determining the concentration of an unknown solution by accurately measuring the volume of a known solution that reacts completely with the unknown solution.

The point when reaction is completed is indicated by the end point of the reaction. If more base (sodium hydroxide) is added to the flask, then more volume of acid will be needed to neutralize it thereby making the calculated concentration of acid for the second trial to decrease.

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