Equivalents Practice Problems

A patient's blood potassium (K⁺) level was measured as 0.025 g/dL. If the normal range is 3.5-5.5 mEq/L, is the value above the normal range of K⁺ in blood?

Consider an intravenous fluid containing Cl⁻, 52 mEq/L of Na⁺, 22 mEq/L of K⁺, and 11 mEq/L of Mg²⁺. Calculate how many equivalents per liter of Cl⁻ are present if it is the only anion in the solution.

A veterinary injection has the following contents: 130. mEq/L Na⁺, 4.00 mEq/L K⁺, 2.70 mEq/L Ca²⁺, 109 mEq/L Cl⁻, and 28.0 mEq/L C₃H₅O₃⁻. Determine how many moles each of Na⁺, K⁺, Ca²⁺, Cl⁻, and C₃H₅O₃⁻ are in a liter of the injection solution. 

Determine how many equivalents are in 4 moles of Cu²⁺ ions. 

Consider 6 moles of SO₄²⁻ ions. Calculate the number of equivalents in this amount of ions.

A certain sports drink has the following ingredients: 1.10 mEq/L Ca²⁺, 0.494 mEq/L Mg²⁺, 22.6 mEq/L Cl^–, and 0.402% (m/v) fructose. Calculate the total osmolarity of the solution and compare it to another sports drink that contains a total of 137 mM of ions.

A certain sports drink has the following ingredients: 1.10 mEq/L Ca  ²⁺, 0.494 mEq/L Mg²⁺, 22.6 mEq/L Cl^–, and 0.402% (m/v) fructose. What is the concentration of each ingredient in molarity (in millimolar)? Note that the molecular weight of fructose is 180.16 g/mol.

A solution available in the laboratory contains 450. mEq/L of I  ^– ions. Calculate the volume (in mL) of the solution needed to provide 2.50 g of I^– ions.

Determine the mass (in grams) required to create a solution containing 0.16 Eq Ni²⁺.

A liquid antacid made up of Al(OH)₃ contains 1.54 mEq/L of Al³⁺. Calculate the mass (in milligrams) of Al³⁺ present in a 355 mL bottle of the antacid.

To prevent seizures, a magnesium sulfate solution is often prescribed to patients via intravenous infusion. Calculate the mass in grams of MgSO₄ if the infusion bag contains 500. mL of 2.50% (m/v) solution. How many milliequivalents of Mg  ²⁺ are in the solution?

Which of the following is true about a solution when it contains 7.2 mEq/L of Fe³⁺?