91Ó°ÊÓ

An aqueous solution that contains 285 ppm of potassium nitrate \(\left(\mathrm{KNO}_{3}\right)\) is being used to feed plants in a garden. What volume of this solution is needed to prepare \(2.0 \mathrm{~L}\) of a solution that is \(75 \mathrm{ppm}\) in \(\mathrm{KNO}_{3}\) ?

What is the concentration of a \(\mathrm{NaCl}\) solution, in \((\mathrm{m} / \mathrm{v}) \%,\) prepared by diluting \(65 \mathrm{~mL}\) of a saturated solution, which has a concentration of \(37(\mathrm{~m} / \mathrm{v}) \%\), to \(480 \mathrm{~mL}\) ?

Concentrated \((12.0 M)\) hydrochloric acid is sold for household and industrial purposes under the name "muriatic acid." How many milliliters of \(0.500 \mathrm{M} \mathrm{HCl}\) solution can be made from \(25.0 \mathrm{~mL}\) of \(12.0 M \mathrm{HCl}\) solution?

Dilute solutions of \(\mathrm{NaHCO}_{3}\) are sometimes used in treating acid burns. How many milliliters of \(0.100 \mathrm{M}\) \(\mathrm{NaHCO}_{3}\) solution are needed to prepare \(750.0 \mathrm{~mL}\) of \(0.0500 \mathrm{M} \mathrm{NaHCO}_{3}\) solution?

What is an electrolyte?

Give an example of a strong electrolyte and a nonelectrolyte.

What does it mean when we say that the concentration of \(\mathrm{Ca}^{2+}\) in blood is \(3.0 \mathrm{mEq} / \mathrm{L} ?\)

Kaochlor, a \(10 \%(\mathrm{~m} / \mathrm{v}) \mathrm{KCl}\) solution, is an oral electrolyte supplement administered for potassium deficiency. How many milliequivalents of \(\mathrm{K}^{+}\) are in a \(30 \mathrm{~mL}\) dose?

Calculate the mass needed for each of the following ion equivalents: (a) \(0.25 \mathrm{Eq} \mathrm{Ca}^{2+}\) (b) \(75 \mathrm{mEq} \mathrm{K}^{+}\) (c) \(199 \mathrm{mEg} \mathrm{SO}_{4}^{2-}\) (d) \(0.65 \mathrm{Eq} \mathrm{PO}_{4}^{3-}\)

The concentration of \(\mathrm{Cl}^{-}\) ion in blood is approximately \(100 \mathrm{mEq} / \mathrm{L}\). How many milliliters of blood would be needed to obtain \(1.0 \mathrm{~g}\) of \(\mathrm{Cl}^{-}\) ions?