Question

How many grams of this substances will dissolve in 100 mL of cold water?

(NH4)2SeO4

Answer 1

 (1) Ce(IO4)4 :

Solubilty of cerium periodate is 2.72 - 2.88 mol/dm3 = 2.72 - 2.88 mol/litre = 2.72 - 2.88 mol/1000 mL

So for 1000 mL 2.72-2.88 moles can be dissolved

for 100 mL 0.272-0.288 moles i.e 0.272-0.288 moles/100 mL

So 0.288 x M wt /100 mL

0.288 x 839.72 g/100 mL

= 241.83 g/100 mL

so for 100 mL of cold water 241.83 grams can be dissolved.

2. RaSO4

The density of RaSO4 is 5.42 g/cm3.= 5.42 g/mL

So for 100 mL of cold water = 5.42 x 100 = 542 g/100 mL

3. Pb(NO3)2 density = 4.53 g/mL

So for 100 mL of cold water = 4.53 x 100 = 453 g/100 mL

4. (NH4)2SeO4

density = 1.769 g/cm3 (20 °C) = 1.769 g/mL

So for 100 mL of ice cold water = 176.9 g/100 mL can be dissolved.

Answer 2

[REMOVED]