Question

what mass of NaCl can be dissolved in 50g of water at 85 c?

Answer 1

Solubility increases with temperature, but the solubility of sodium chloride in water is 316 grams per litre at 0 degrees Celsius, and 330 grams per litre at 70 degrees Celsius. Since room temperature is somewhere between these two, this gives upper and lower limits of the solubility at room temperature.

50 grams of water has a volume of 50 cubic centimetres, or 0.05 litres. In one litre you could dissolve between 316 grams and 330 grams, so in 0.05 litres you could dissolve between 15.8 and 16.5 grams, where 15.8 = 316 x 0.05 and 16.5 = 330 x 0.05.

So we can say it's around 16 grams of NaCl in 50 grams of water at room temperature.

Answer 2

ohh well its a multiple choose question but theres no 16

Answer 3

its either 20,40,60,80,or 120

Answer 4

hmmm thats hard
try 20 since its kinda close to 16?