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Calculating Percent KH2PO4 in a Sample

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Questions and Answers

What is the purpose of back titration in acid-base titration?

To neutralize the excess titrant.

To determine the end point precisely.

To consume the analyte using excess titrant. (correct)

To determine the initial concentration of the analyte.

In back titration, why is the end point intentionally overshot?

To speed up the reaction.

To ensure all analyte is consumed. (correct)

To create a visible color change for the indicator.

To reduce the amount of titrant needed.

In compleximetric titration, what is a chelating agent?

The metal ion being titrated.

The ligands that have two or more bonding sites. (correct)

The EDTA ligand.

Any neutral molecule used as a ligand.

What is the role of Eriochrome Black T in EDTA titrations?

To form a colored complex with metal ions. Signup and view all the answers

How does EDTA react with metal ions in water hardness determination?

It forms a complex with metal ions. Signup and view all the answers

Why is an ammonia buffer used in water hardness determination?

To maintain a neutral pH during titration. Signup and view all the answers

What is the significance of the sharp increase in pH at the center of the titration curve?

It shows the equivalence point of the titration. Signup and view all the answers

In acid-base titration, what effect does a weaker acid (smaller Ka) have on the pH value at the equivalence point?

Increases the pH value at the equivalence point. Signup and view all the answers

What is the primary purpose of using acid-base indicators in titration?

To identify the equivalence point of the titration. Signup and view all the answers

What is unique about the neutralization process of sulfuric acid compared to phosphoric acid when titrated with OH- ions?

Phosphoric acid is neutralized simultaneously while sulfuric acid is neutralized step by step. Signup and view all the answers

How is alkalinity defined in the context of acid-neutralizing capacity?

The millimoles of H+ required to reach a pH of 4.5 in water samples. Signup and view all the answers

What property makes a substance an ideal standard for titration?

High molecular weight Signup and view all the answers

In a titration, what is the titer of a titrant?

The weight of substance titrated consumed by 1 mL of titrant Signup and view all the answers

What is the molarity of the hydrochloric acid solution if 0.600 g of primary standard NaOH was neutralized by 25.00 mL of HCl?

0.4825 M Signup and view all the answers

What volume of 0.125 M HNO3 is needed to neutralize 0.300 g of Ca(OH)2 assuming one mole of HNO3 reacts with one mole of Ca(OH)2?

9.6 mL Signup and view all the answers

What is the percent analyte in the sample if 20.02 mL of 0.0521 M NaOH was needed to neutralize 0.425 g of an acid?

2.60% Signup and view all the answers