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Preparing a Solution of Known Molarity

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Questions and Answers

What is the correct mass of NaOH in grams required to prepare 500 ml of 2.80 M solution?

112.0 g

14.0 g

28.0 g

56.0 g (correct)

How would you prepare 250 ml of a 0.707M NaNO3 solution?

Dissolve 60.08g NaNO3 in 250ml water

Dissolve 30.04g NaNO3 in 250ml water

Dissolve 15.02g NaNO3 in 250ml water (correct)

Dissolve 7.51g NaNO3 in 250ml water

How many moles of MgCl2 are present in 60.0 mL of 0.10 M MgCl2 solution?

60 moles

6 moles

600 moles

0.006 moles (correct)

How many grams of KOH are present in 35.0 mL of a 5.50 M solution?

22.825 g Signup and view all the answers

What is the molarity of a solution if the mass of NaOH is 40g and the volume is 500 ml?

$M = \frac{40 \times molar ext{ }mass}{500}$ Signup and view all the answers

What is the mass of NaOH in grams required to prepare 500 ml of 2.80 M solution?

56.0 g Signup and view all the answers

How would you prepare 250 mL of a 0.707 M NaNO3 solution?

Dissolve 15.02g NaNO3 in 250ml water Signup and view all the answers

How many moles of MgCl2 are present in 60.0 mL of 0.10 M MgCl2 solution?

0.006 moles Signup and view all the answers

How many grams of KOH are present in 35.0 mL of a 5.50 M solution?

96.25 g Signup and view all the answers

Study Notes

Molarity and Solution Preparation

To prepare a solution, you need to know the molarity (M) and the volume in liters (L) to find the number of moles, and then use the molar mass to find the mass in grams.

NaOH Solutions

To prepare 500 ml of a 2.80 M NaOH solution, you need to calculate the mass of NaOH in grams required.
The molarity of a solution can be calculated if the mass of NaOH is 40g and the volume is 500 ml.

NaNO3 Solutions

To prepare 250 ml of a 0.707 M NaNO3 solution, you need to calculate the mass of NaNO3 in grams required.

MgCl2 Solutions

The number of moles of MgCl2 present in a solution can be calculated if the volume and molarity are known, such as 60.0 mL of 0.10 M MgCl2 solution.

KOH Solutions

The mass of KOH in grams present in a solution can be calculated if the volume and molarity are known, such as 35.0 mL of a 5.50 M solution.

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Description

Learn about the process of preparing a solution of known molarity using a volumetric flask and solid solute. Understand the steps involved in dissolving the solute and reaching the desired volume.