Determine how the following scenarios will affect the calculations in Parts A. B

Question

Determine how the following scenarios will affect the calculations in Parts A. B and C. a. How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease or have no effect? Explain. How will the molar mass be affected if some of the solid remained after the titration was complete? Will the molar mass increase, decrease or have no effect? Explain. How will the calculated concentration of acetic acid in vinegar be affected if the liquid retained in the pipet is blown out? Will the concentration of acetic acid in vinegar increase, decrease, or have no effect? Explain. How will the calculated concentration of acetic acid in vinegar be affected if during the titration an air bubble appears in the tip of the buret and is not noticed until the endpoint is reached? Will the concentration increase, decrease or have no effect? Explain.

Explanation / Answer

4d

concentration of acetic acid vinegar affected if...

air bubbles appear in the tip of the buret

this means, we have excess volume in buret... you will mark 50 mL of base but actually is less.. since it is including th ebubble

so the amount of base used is actually LESS than the one read

so if base is falsely increased, then we will have incorrect mol of base calculation

which we relate directly to mol of acid

so the concentration of acid will be larger than the actual value

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