Question

7) An 800 g solution of Kool-Aid contains 780 g of water. What is the mass percent of solute in this solution? (800 - 780)/800 * 100% = 2.5% 8) How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution? 9) Which mixture(s) do particles not settle out of the solution? Solutions Colloids Suspensions

Answer 1

(7) mass of solute=800g-780g=20g

mass%of the solute in this solution=(20g/800g)*100%=2.5%

Hence,2.5%

(8) Assume V1=500ml M1=2.4M M2=1.0M

V2 we need to calculate

Here using equation M1× V1=M2× V2

2.4×500=1.0×V2

=>V2=1200ml

Hence we need 1.2L or 1200mL of water to make a solution of 1.0M.

(9) Colloids

The particles of colloids remain dispersed and do not settle due to gravity.