Please match the following responses with the questions below. ABCDEFGHIJ Used i

Question

Please match the following responses with the questions below.

ABCDEFGHIJ Used in measuring the 6M NaOH to prepare the titrant.
ABCDEFGHIJ At what place does an indicator change color during a titration?
ABCDEFGHIJ A very corrosive reagent used in this experiment.
ABCDEFGHIJ The moles of the titrant OH- added equals moles KHC8H4O4 in the sample.

Explanation / Answer

1) B and G

The hydrogen of Potassium hydrogen phthalate, is slightly acidic, and it is often used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately.

2)H and E

phenolphthalein turns colorless in acidic solutions and pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In strongly basic solutions, phenolphthalein's pink color undergoes a rather slow fading reaction and becomes colorless again. Thus used as an endpoint indicator.

3) G i.e. potassium hydrogen pthallate

4) I i.e. for this experiment the condition that is true at endpoint.

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