# At what temperature can we dissolve equal amounts of ammonium chloride and hydrogen chloride in the same amount of water?

Apr 18, 2017

Equal amounts can be dissolved at 58 °C.

#### Explanation:

I presume that you are asked to interpret a solubility curve like the one below.

(Adapted from KentChemistry HOME)

Find the curves for $\text{NH"_4"Cl}$ and $\text{HCl}$ and locate the point where they cross.

Then, drop a line down to the temperature axis and note the temperature.

In this diagram, it looks like both compounds have the same solubility (about 56 g/100 g of water) at 58 °C.