Calcium Carbonate Is Used to Form Exoskeletons

question 3

Multiple Choice

Calcium carbonate is used to form exoskeletons. It has a solubility-product constant of 5.0 * 10^-9. What is the molar concentration of calcium ions in a saturated solution of calcium carbonate?

• A) 2.5 *10^-9 M
• B) 7.1 *10^-5 M
• C) 3.5 *10^-5 M
• D) 5.0 *10^-9 M
• E) 4.7 *10^-7 M

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Definitions:

ssRNA

Single-stranded RNA, which can act as a template for protein synthesis or be involved in the replication of some viruses.

rRNA

Ribosomal RNA, a type of RNA that, along with proteins, forms the structure of ribosomes and helps synthesize proteins in cells.

dsRNA

Double-stranded RNA, a molecular structure consisting of two complementary strands of RNA which can interfere with gene expression.

Single Stranded DNA

DNA consisting of only one strand, as opposed to the double-stranded structure of typical DNA, often found in some viruses.