Terms used in Titration Please match the following responses with the questions

Question

Terms used in Titration Please match the following responses with the questions below. hthalein B Endpoint C For this experiment: the condition that is true at the endpoint D Pump Dispenser e 6M NaOH (sodium hydroxide) F Primary Standard G Buret H KHCgH404 (potassium hydrogen phthalate) t Titrant None of the above Used during a titration to measure the volume of titrant delivered The moles of the titrant OH- added equals moles KHC8H404 in the sample At what place does an indicator change color during a titration? Used in measuring the 6M NaOH to prepare the titrant. Tries 0/99

Explanation / Answer

Ans.#1. G. Burette: Used during titration to measure the volume of titrant delivered.

The burette has markings that indicate the volume. The volume of titrant (solution filled in burette) consumed during titration is given as the difference in final and initial volume of titrant during particular titration event.

#2. For this experiment: the condition that is true at the endpoint: The moles of titrant OH- added equals moles of KHC8H4O4.

1 mol NaOH neutralizes 1 mol KHP. Hence, moles of OH- is equal to moles of KHP.

# In some reaction, where the stoichiometry of acid- base neutralization is is NOT equal to 1:1, the moles of OH- won’t be equal to that of acid at the end point.

For example,              2 NaOH + H2SO4 -------> 2 H2O + Na2SO4

Here, moles of OH- is equal to (2 x moles of acid) at the endpoint.

#3. B. Endpoint: At what place does an indicator change color during a titration.

In all titration events, the endpoint is indicated by color change of the indicator.

#4. D. Pump dispenser: Used in measuring the 6M NaOH to prepare the titrant.

A pump dispenser is a semi-automatic or automatic digital/manual dispenser. It can be fitted at the mouth of a standard reagent bottle like a cap. Once assembled, it can be used to dispense specified volume of the liquid filled in bottle.

Pump dispenser is generally used to dispense acid, bases and other corrosive and toxic liquids simultaneously with eliminating/minimizing the chances of spillage and leak into the atmosphere.   

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