5. Water Quality

Water Chemistry — Quiz

Test your understanding of water chemistry with 5 practice questions.

Practice Questions

Question 1

If a water sample contains 0.01 M Na⁺, 0.002 M Ca²⁺, and 0.012 M Cl⁻, what is the ionic strength of the solution?

Question 2

Given the solubility product constant $K_{sp}$ of calcium carbonate (CaCO₃) is $4.8\times10^{-9}$, what is its molar solubility $s$ in pure water?

Question 3

A 100 mL water sample requires 5.00 mL of 0.0100 M EDTA to reach the endpoint in a hardness titration. What is the calcium hardness in mg/L as CaCO₃?

Question 4

If the electrical conductivity of a water sample is 1200 μS/cm, and TDS (mg/L) ≈ 0.67×EC (μS/cm), what is the approximate TDS?

Question 5

Which electrode is typically used to measure oxidation–reduction potential (ORP) in water quality analysis?