Homework Help: Chemistry-Help Please!

Posted by Julie on Thursday, May 19, 2011 at 4:13pm.

@ 20 Celsius - 22g CuSO4 / 100g H2O
@ 40 Celsius- 42g CuSO4 / 100g H2O

Using this, answer whether these are saturated or unsaturated

@ 40 Celsius is 5g CuSO4 / 10g H2O

@ 40 Celsius is 99g CuSO4 / 250g H2)

I was told that the first one is unsaturated and the second one is saturated but...I come up the opposite of what I was told....Help please!

Also, I looking for someone to tell me if the answers are correct that I came up with to these questions.

Can anyone tell me if I am right on these?

Calculate the amount of solute needed to make each of the solutions

225g of 10% (m/m) K2CO3 solution
Answer: 22.5g K2CO3

0.50kg of 18% (m/m) KOH solution
Answer: 90g KOH

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