Required Practical: Making a Standard Solution

Make 250 cm³  of a 0.100 mol dm^-3  solution of sodium hydrogensulfate.

Equipment:

• Weighing Boat
• Volumetric Flask 
• Sodium Hydrogensulfate Solid
• Filter Funnel
• Spatula
• Distilled (or de-ionised) water in a wash bottle
• 250cm³beaker
• Glass rod
• Digital mass balance (weighing scales), that read to at least 2 d.p.
• Pipette

Method

1) Calculate the mass of sodium hydrogensulfate solid that will make 250 cm³  of a 0.100 mol dm³  sodium hyrdrogensulfate.

Do this by working out the number of moles of sodium hydrogensulfate needed, with the equation n = cv (number of moles = concentration x volume) and then using the number of moles required in the equation n = m ÷ Mr (number of moles = mass ÷ molecular mass) to work out the mass of solid needed.

2) Weigh a clean and dry weighing boat using the digital balance. Record the mass.

3) Leave the weighing boat on…