Experiment 8

Quantitative Analysis 3 : Standard Solutions

Aim : To prepare a standard solution .

Directions :
You are to prepare a 0.25 molar solution of sodium hydroxide in a 250 ml flask . 
Place water into the flask to around quarter the volume . Weigh out the correct 
mass of sodium hydroxide pellets on a filter paper . Gently tap the hydroxide 
pellets into the flask through a funnel . Reweigh the filter paper . Gently use 
water from a wash bottle to allow all the pellets to enter the flask . Stopper 
the flask and swirl to allow the pellets to dissolve . Add more water to the neck 
of the stem . Swirl again . When the pellets have dissolved add water to the line
 on the stem and swirl . Let the flask stand to allow the solution to homogenize .