Question

a.)Suppose you were preparing 1.0 L of a bleaching solution in a volumetric flask, and it calls for 0.26 mol of NaOCl. If all you had available was a jug of bleach that contained 0.74 M NaOCl, what volume of bleach would you need to add to the volumetric flask before you added enough water to reach the 1.0 L line?

Express the volume in milliliters to two significant figures

b.) You need to prepare a 2.40 M solution of sodium hydroxide (molar mass of sodium hydroxide = 40.00 g/mol ), but you only have a 10 mL graduated cylinder and a 25 mL beaker. Complete the following sentences regarding the concentration of the prepared solution.

Match the words below to the appropriate blanks in the sentences. Make certain each sentence is complete before submitting your answer.

exactly 10.0mL

greater than 10.0mL

less than 10.0ml

0.024g

0.960g

Exactly 2.40 M

Greater than 2.40M

Less than 2.40M

1. In order to prepare 10.0 mL (0.0100 L) solution of 2.40 M sodium hydroxide, a mass of ______ would be required

2.When the solute and a total of 10.0 mL of water are both added into the beaker and stirred until the solute dissolves, the solution volume will be_____

3.Based on that, the concentration of the prepared solution will be______

c.) You are asked to prepare a 1.000 L solution of 4.5 M C6H12O6 (glucose; molar mass = 180.16 g/mol) in a lab by dissolving 811.0 g of glucose in water. Consider the following two scenarios in which you commit a user error while preparing this solution.

	Prepared in a volumetric flask	Prepared in a beaker
Assumed volume	1.000 L	1.000 L
Volumetric error	Added water 2.0 cm above the line, which corresponds to 6.3 mL (0.0063 L) additional solution volume	811.0 g takes up 526 mL of space rather than 500 mL of space
Preparation details	You add the glucose to a volumetric flask and then add water until it dissolves. The water bottle you are using has a worn tip, and you inadvertently add too much water such that the meniscus is above the line. The diameter of the neck of the volumetric flask is 2.29 cm .	You prepare the solution by adding glucose to a large beaker and approximated the volume of the glucose to be 500 mL . Therefore, you add 500. mL of water to the 526 mL in the beaker using a graduated cylinder.

You decide to evaluate and compare the errors you made while preparing the solutions using the different methods. Calculate the actual concentrations of the intended 4.5 M glucose solutions prepared by each method based on their actual final volumes.

Express the concentrations in molarity to two decimal places.

Flask=

Beaker=

Answer 1