GC Solutions Unit Review

Front

What factors increase the rate of dissolving a solid in a liquid?

Back

Stirring the solution, crushing up the solute, and raising the temperature of the water increase the rate of dissolving.

Front

What is molarity?

Back

Molarity (M) is a measure of concentration defined as the number of moles of solute per liter of solution.

Front

Which solution has the highest concentration: 1.5 M, 0.5 M, 2.4 M, or 0.08 M?

Back

2.4 M has the highest concentration.

Front

How do you calculate molarity?

Back

Molarity = moles of solute / liters of solution.

Front

What is the molarity of 4 g of NaCl in 3,800 mL of solution? (Molar Mass = 58.45 g/mol)

Back

0.018 M.

Front

What is an acid?

Back

An acid is a substance that donates protons (H+) in a solution.

Front

Which of the following is an acid: Ca(OH)2, KOH, NH4OH, H2CO3?

Back

H2CO3 is an acid.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.

Front

What is the H+ concentration if the pH = 8.0?

Back

1 x 10^-8 M.

Front

What happens to the solubility of most solids as temperature increases?

Back

The solubility of most solids increases as temperature increases.