Question

1. calculate the molar mass of khp
2. what is a colorimetric ph indicator? how do they work? how is ph paper used?

Explanation:

1)

Step1: Determine the chemical formula and atomic masses

KHP is potassium hydrogen phthalate, with the formula \(KHC_8H_4O_4\).
Atomic masses: \(K = 39.10\ g/mol\), \(H= 1.01\ g/mol\), \(C = 12.01\ g/mol\), \(O=16.00\ g/mol\)

Step2: Calculate the molar mass

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A colorimetric pH indicator is a substance that changes color depending on the pH of the solution it is in. They work based on the principle that the indicator exists in two forms (acid - base forms) with different colors. The equilibrium between these forms shifts with pH changes. For pH paper, a small piece of the paper is dipped into the solution. The paper contains a mixture of pH indicators. The color of the paper after dipping is compared to a color chart (usually provided with the pH paper) to determine the pH of the solution.

Answer:

\(204.23\ g/mol\)

2)