About Half of the Sodium Carbonate Produced Is Used in Making

question 9

Multiple Choice

About half of the sodium carbonate produced is used in making glass products because it lowers the melting point of sand, the major component of glass. When sodium carbonate is added to water it hydrolyses according to the following reactions. CO₃^2-(aq) + H₂O(l) HCO₃^-(aq) + OH^-(aq) K₁
HCO₃^-(aq) + H₂O(l) H₂CO₃(aq) + OH^-(aq) K₂
These can be combined to yield
CO₃^2-(aq) + 2H₂O(l) H₂CO₃(aq) + 2OH^-(aq) K₃
What is the value of K₃?

• A) K₁ × K ₂
• B) K₁ ÷ K ₂
• C) K ₁ + K ₂
• D) K ₁ - K ₂
• E) (K₁K₂)²

---

Definitions:

Natural Caregivers

Individuals who innately possess a tendency or ability to provide care and support to others in a compassionate manner.

NCDA Policy

Guidelines and stances established by the National Career Development Association that govern the practice and ethics of career development professionals.

Occupational Choices

The selection of careers or jobs based on personal preference, skill set, and market opportunities.

Community Career Development Centers

Provide resources, guidance, and support for individuals in their professional development and employment search, often offering services like career counseling and job training.