# Solubility in wrong temperature?

I have a question on my chemistry homework that asks for the solubility of zinc oxide (ZnO) in water at 20 degrees celsius

I found the solubility, but in 30 degrees instead of 20

0.16 mg/100 mL

would I be able to take .16, divide it by 30 then multiply it by 20 to get the solubility in 20 degrees, or would that not work?

this comes out as .112 (or .11 I guess because there's two significant figures)

google doesn't seem to give me the solubility in 20 degrees.

• No it doesn't work that way. Think about it. If it were so should the temperature be measured in Fahrenheit, Rankin, Celsius, Kelvin, Rømer, ... – MaxW Feb 7 '16 at 6:58

## 1 Answer

The solubility of Zinc Chloride in water at 20°C is 395g/100g.

The table below shows the solubility (g/100g) of zinc compounds at different tempearates. • That seems high. Are you sure it isn't 395g/kg? – SendersReagent Feb 7 '16 at 10:15
• The numbers are from Wikipedia. The page says that the units of solubility are given in grams per 100 grams of water (g/100g). Take a look at en.wikipedia.org/wiki/Solubility_table – Hammad Ahmed Feb 7 '16 at 16:30
• You're right, but if you go to the $\ce{ZnCl2}$ page, 437 g/L instead of g/100g. I think the person who filled out the table is confused. Important to note, however, is that the question asked about zinc oxide, not zinc chloride. – SendersReagent Feb 7 '16 at 17:04
• Then Wikipedia is wrong on this one. $\ce{ZnCl2}$ dissolves immensely well, pretty much like sugar. But this is an offtopic here anyway. – Ivan Neretin Feb 7 '16 at 19:05