The accuracy of this experiment depends on good technique. Would the following t

Question

The accuracy of this experiment depends on good technique. Would the following techinque errors result in an erroneously high or an erroneously low calculated molarity of an NaOH solution? Breifly explain your reasoning for each answer. a) The KHP you used had not been dried. b) When filling the buret with NaOH you left a air bubble in the buret tip. b)The bubble was released during your first KHP titration. c) After completeing the titration you noticed droplets of titrant clinging to the inner wall of the buret.

Explanation / Answer

The accuracy of the experiment depends on good technique.

Influence of the following technique errors on molarity of NaOH solution,

a) The KHP you used had not been dried : erroneously high molarity.

The calculate moles of KHP would be higher than actual value, but the volume of NaOH used for titration would be much lower due to less KHP is solution.

b) When filling the buret with NaOH you left a air bubble in the buret tip : erroneously low molarity of NaOH

We would calculate higher volume of NaOH added than the actual value and thus the molarity becomes lower.

b)The bubble was released during your first KHP titration : erroneously low molarity

The volume of NaOH used was calculate higher than actual amount. molarity = moles/volume. Higher volume would give lwer molarity.

c) After completeing the titration you noticed droplets of titrant clinging to the inner wall of the buret : erroneously low molarity.

Acual volume of NaOH added is lower than calculate (some remained in the buret). Thus molarity if lower.

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