Introduction to Unit 8: Acids and Bases

What is the definition of an acid?

• A substance that, when dissolved in water, increases the number of hydroxide ions.

• A solution in which the solvent is water.

• Any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.

• Any compound that can dissociate to form ions when it dissolves in water.

You have a stock solution with 19 M NaOH. You need to make 500 mL of a 1 M solution for your experiment. What volume of the stock solution should you use?

• 57.89 mL

• 26.32 mL

• 34.98 mL

• 43.00 mL

Explain the difference between a dilute and a concentrated solution in terms of moles of solute and liters of solution.

• A dilute solution has the same moles of a solute as a concentrated solution, but the dilute solution has more liters of solution.

• A concentrated solution has the same moles of a solute as a dilute solution, but the concentrated solution has more liters of solution.

• A dilute solution has the same liters of solute as a concentrated solution, but the dilute solution has more moles of solution.

• A dilute solution has the same moles of a solution as a concentrated solution, but the dilute solution has more liters of solute.

What type of electrolyte dissociates completely in water?

• Semielectrolyte

• Weak Electrolyte

• Nonelectrolyte

• Stong Electrolyte

What is the molarity of a solution with 13.8 mol of NaCl dissolved in 2.50 L of water?

• 0.552 M

• 5.52 M

• 5.52 m

• 0.552 m