The Balanced Net Ionic Equation for Precipitation of CaCO₃ When

question 122

Multiple Choice

The balanced net ionic equation for precipitation of CaCO₃ when aqueous solutions of Na₂CO₃ and CaCl₂ are mixed is __________.

• A)2Na⁺ (aq)+ CO₃^2- (aq)→ Na₂CO₃ (aq)
• B)2Na⁺ (aq)+ 2Cl^- (aq)→ 2NaCl (aq)
• C)Na⁺ (aq)+ Cl^- (aq)→ NaCl (aq)
• D)Ca²⁺ (aq)+ CO₃^2- (aq)→ CaCO₃ (s)
• E)Na₂CO₃ (aq)+ CaCl₂ (aq)→ 2NaCl (aq)+ CaCO₃ (s)

---

Definitions:

Materials Price Variance

The difference between the actual cost of direct materials and the expected cost, based on standard price and actual quantity purchased.

Materials Purchased

The total value of raw materials bought by a company for use in production during a specific time period.

Labor Rate Variance

The difference between the actual cost of direct labor and the expected (or standard) cost, reflecting how efficiently labor resources are used.

Skilled Workers

Individuals who possess specialized training, expertise, or significant experience in a particular field or job.