A Sample of Water Has Hardness Expressed as 160 Ppm

question 42

Multiple Choice

A sample of water has hardness expressed as 160 ppm Ca2⁺. The sample is passed through an ion exchange column and the Ca²⁺ ions are replaced by Na⁺ ions. What is the [Na⁺] in ppm of the water after it has been treated? (1 ppm = 1 g solute/106 g solution)

• A) 46.0
• B) 92
• C) 184
• D) 320
• E) 80.0

Comprehend how the elasticity of demand varies along different points of a demand curve.

Identify conditions under which demand is considered elastic or inelastic.

Analyze the impact of price changes on quantity demanded for products with different elasticity levels.

Interpret the effects of elasticity on total revenue and expenditure.

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