# Question 9d1e8

Jul 31, 2017

For question 11., we look at (a) the curve for ${\text{KNO}}_{3}$ (in green) and (b) the $35$ $\text{^"o""C}$ vertical line, and see where they intersect.

They appear to intersect $\approx 54$ $\text{g/"100"g H"_2"O}$, so the calculation of

$115$ ${\text{g KNO}}_{3}$ $- 54$ ${\text{g KNO}}_{3}$ = ul(61color(white)(l)"g KNO"_3

is correct.

For question 12., we look at (a) the curve for $\text{KCl}$ (the diagonal dark blue line) and (b) the $80$ $\text{^"o""C}$ vertical line, and see where they intersect,

The point of intersection is $\approx 52$ $\text{g/"100"g H"_2"O}$. Therefore, if two hundred grams of water are used, the result is double this value:

$52$ $\text{g KCl}$ xx 2 = ul(104color(white)(l)"g KCl"#