Question bank: Concentration Units: Molarity

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Question 1:

Medium

Consider an experiment in which a sample of 5 mmol of sodium hydroxide (NaOH) solution was added to a sample of 10 mL of distilled water to form a new homogeneous mixture. Which of the alternatives below correctly describes the final concentration of this new mixture?

Concentration Units: Molarity

Contextualized Question

Question 2:

Medium

You have been hired as a chemist in an industry and your first task is to prepare a solution for application in an industrial process. To do this, it is necessary to make an aqueous solution with a concentration of 0.5 mol/L of sodium chloride (NaCl). Your team has a 1-liter volumetric flask and a bottle of pure sodium chloride. (a) Determine the mass of NaCl needed to prepare the solution. (b) Explain the procedure to be followed to prepare this solution. (c) If necessary, how would you prepare a solution with half of this concentration, while keeping the volume at 1 liter?

Concentration Units: Molarity

Question 3:

Medium

Concentration Units: Molarity

Basic Calculus

Question 4:

Medium

During a practical Chemistry class, students are preparing solutions of sodium chloride (NaCl) and potassium chloride (KCl) from solid substances and water. Suppose a group of students received 30 g of NaCl and 45 g of KCl. (a) Determine the amount of moles of NaCl and KCl used in practice by the students. (b) If the students decide to mix the two salts resulting in a 350 mL solution, calculate the concentration (in mol/L) of each of them in the solution. (c) Based on the stoichiometric relationship of the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl), which forms NaCl and water, calculate the mass of NaOH needed to produce the amount of moles of NaCl calculated in item (a). Data: Molar mass of NaCl = 58.5 g/mol, Molar mass of KCl = 74.6 g/mol, Molar mass of NaOH = 40 g/mol.

Concentration Units: Molarity

Question 5:

Easy

A student prepared 100 mL of a solution containing 0.5 mol/L of sulfuric acid (H2SO4). What would be the mass of this acid in the solution?

Concentration Units: Molarity

Basic Calculus

IARA TIP

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