Question 1

Which of the following best describes what happens when acetic acid ($$\mathrm{HC_2H_3O_2}$$), a weak electrolyte, dissolves in water?

Accepted Answer

It produces mostly molecules and a few ions in solution.

Question 2

A patient receives 1250 mL of Ringer’s solution containing 109 mEq/L of $$\mathrm{Cl^-}. $$How many moles of chloride ion did the patient receive? (Use $$1\ \mathrm{Eq} = 1000\ \mathrm{mEq}$$ and $$1\ \mathrm{mol\ Cl^-} = 1\ \mathrm{Eq})$$

Accepted Answer

$$0.136$$ mole

Question 3

At $$20\ ^\circ\mathrm{C}$$, the solubility of KCl is $$34\ \mathrm{g}/100.\ \mathrm{g\ H_2O}. If$$ $$75\ \mathrm{g} of $$KCl is mixed with $$200.\ \mathrm{g\ H_2O} at $$this temperature, how much KCl will remain undissolved?

Accepted Answer

$$7\ \mathrm{g}$$

Question 4

Which of the following compounds is expected to be soluble in water, and why?

Accepted Answer

$$\mathrm{Na_3PO_4}$$, because all sodium salts are soluble.

Question 5

Calculate the mass percent $$(\mathrm{m/m}) of $$NaOH in a solution prepared by dissolving $$30.0\ \mathrm{g} of $$NaOH in $$120.0\ \mathrm{g} of $$water.

Accepted Answer

$$25.0\%$$

Question 6

A topical ointment contains $$3.5\%$$ $$(\mathrm{m/m})$$ neomycin. How many grams of neomycin are in a $$64\ \mathrm{g}$$ tube?

Accepted Answer

$$2.2\ \mathrm{g}$$

Question 7

What is the volume percent $$(\mathrm{v/v}) of $$alcohol in a solution made by mixing $$49\ \mathrm{mL} of $$alcohol with enough water to make $$59\ \mathrm{mL} of $$solution?

Accepted Answer

$$83\%$$

Question 8

A potassium iodide solution is prepared by dissolving $$5.0\ \mathrm{g} of KI in $$enough water to make $$250\ \mathrm{mL} of $$solution. What is the mass/volume percent $$(\mathrm{m/v}) of KI$$?

Accepted Answer

$$2.0\%$$

Question 9

How many grams of clindamycin are in $$60.\ \mathrm{mL} of a$$ $$1.0\%$$ $$(\mathrm{m/v})$$ clindamycin solution?

Accepted Answer

$$0.60\ \mathrm{g}$$

Question 10

What is the molarity $$(M) of a $$solution prepared by dissolving $$60.0\ \mathrm{g} of $$NaOH in $$0.250\ \mathrm{L} of $$solution? $$(\mathrm{Molar\ mass\ of\ NaOH} = 40.0\ \mathrm{g/mol})$$

Accepted Answer

$$6.00\ \mathrm{M}$$

Question 11

How many liters of a $$2.00\ \mathrm{M}$$ NaCl solution are needed to provide $$67.3\ \mathrm{g} of $$NaCl? $$(\mathrm{Molar\ mass\ of\ NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.576\ \mathrm{L}$$

Question 12

A $$4.00\ \mathrm{M}$$ KCl solution is diluted from $$75.0\ \mathrm{mL} to$$ $$500.\ \mathrm{mL}. $$What is the final molarity?

Accepted Answer

$$0.600\ \mathrm{M}$$

Question 13

How many milliliters of a $$50.0\%$$ $$(\mathrm{m/v})$$ dextrose solution are needed to prepare $$1000.\ \mathrm{mL} of a$$ $$35.0\%$$ $$(\mathrm{m/v})$$ dextrose solution?

Accepted Answer

$$700.\ \mathrm{mL}$$

Question 14

A red blood cell is placed in a $$10\%$$ $$(\mathrm{m/v})$$ glucose solution. What will happen to the cell?

Accepted Answer

It will shrink (crenate).

Question 15

Which of the following best explains why $$\mathrm{$$MgCl_2$$} is $$soluble in water?

Accepted Answer

All chloride salts are soluble except those with Ag$$^+$$, Pb$$^{2+}$$, or Hg$$_2$$^{2+}$$.

Question 16

Which of the following statements about nonelectrolytes is correct?

Accepted Answer

They produce only molecules in solution.

Question 17

A solution is prepared by dissolving $$12\ \mathrm{g} of $$NaOH in enough water to make $$220\ \mathrm{mL} of $$solution. What is the mass/volume percent $$(\mathrm{m/v}) of $$NaOH?

Accepted Answer

$$5.5\%$$

Question 18

Which of the following best describes what happens to a red blood cell in a $$0.2\%$$ $$(\mathrm{m/v})$$ NaCl solution?

Accepted Answer

It will undergo hemolysis.

Solutions: Concentration Calculations and Dilution in Chemistry

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