How do you make up 25 cm3 of a 1 M solution of NaOH?
Corrie writes … A 1 M solution of NaOH will contain 40g (1 mol) of NaOH per dm3 or 1000 cm3. Therefore 25 cm3 of a 1M solution should contain 25/1000 x 40 g of NaOH – that is a mass of 1 g of NaOH. So you need to weigh out 1 g of NaOH, taking note of the precautions necessary when handling this corrosive substance. Remember too that NaOH absorbs water and carbon dioxide from the air, so if you leave it on the balance too long its mass will slowly increase! Dissolve the NaOH in a small amount of water (about 15 cm3) in a beaker. Transfer the solution into a 25 cm3 volumetric flask and make it up to 25 cm3, or just use a measuring cylinder if you are not too worried about accuracy. Always carry out a risk assessment and check with your teacher before starting any practical work. Risk assessment Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide ap
