Question

100 POINTS! HELP ME IF YOU LOVE JESUS!

A solution contains 150 g of water and 55 g of sodium chloride is at 80℃. Will all of the salt be dissolved into the water? Mathematically explain your answer.

Answer 1

I only got 50 points (which is not 100). :-)

Look at the graph. At 80 °C, about 38 g of solute is able to dissolve, and that’s for ever 100 g of water. That means that for every 150 grams of water, 57 grams of solute can dissolve (38/2 = 19 + 38 = 57 g) at 80 °C. Since 57 g is greater than 55 g, all for he sodium chloride should dissolve in 150 g of water at 80 °C - you can put all of that into a “mathematical explanation”.