Which Ion(s) Are Responsible for Water Being Classified as "Hard

question 34

Multiple Choice

Which ion(s) are responsible for water being classified as "hard"?

• A) Ca⁺²
• B) Fe⁺³
• C) Mg⁺²
• D) all of these
• E) none of these

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Definitions:

Perfectly Elastic

This term refers to a situation in demand or supply where the quantity demanded or supplied responds infinitely at a particular price level.

Excise Tax

A type of tax imposed on specific goods, services, or transactions, often with the intent of discouraging their use or consumption, or to raise revenue.

Downward-Sloping

A term typically used in economics to describe a curve or line on a graph that represents a decrease in one variable as another variable increases, often used to describe demand curves.

Excise Tax

A specific tax levied on the sale of a particular good or service, typically to discourage its consumption or to raise revenue.