PREPARING A SOLUTION

Name                                                                                                    Data

PREPARING A  ZINC SULPHATE SOLUTION

1.   BACKGROUND INFORMATION

We can prepare a solution when a solid dissolves in a liquid homogenously.

The solid is referred to as the solute. The liquid is referred to as the solvent.

A dilute solution is one where there is a lot of solvent and only a little solute

A concentrated solution is one where there is a lot of solute and only a little solvent.

We can express the concentration in differents ways:

We already learnt g/L

Today we are going to learn molarity (mol/L)

2.   OBJECTIVES

-          Prepare a zinc sulphate ZnSO₄ solution 1M

3.   MATERIAL

-          Digital balance

-          Beaker

-          ZnSO₄  ( Mr= 287,4 g/mol   ZnSO₄)

-          Pipet Pasteur

-          Volumetric flask 100 ml

-          Watch glass

-          graduated cylinder
d    

4.   EXPERIMENTAL PROCEDURE

1.    Calculate mols needed of 100 ml  ZnSO₄ solution (1M) and after that determine the grams needed

2.    Weight 28,5 grams of ZnSO₄ in the beaker

3.    Measure 70 ml of water

4.    Add 70 ml of water 

5.    dissolve ZnSO₄ in water

6.    Transfer the mixture to the volumetric flask

7.    Rinse the beaker several times with small portions of water

8.    add water to the volumetric flask calibration mark, pay attention to the meniscus.

***SAFETY

-          Use gloves

 Use safety glasses