1. Calculate the concentration of a solution which contains 12 g of area in 160 g of solution.
2. Calculate the mass of glucose needed to prepare 250 g of 5% solution by mass.
3. 5 mL of H202, is dissolved in 95 mL of water. Calculate its percentage in volume by volume.
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Answers
Explanation:
1. (m/m)%=mass of solute/mass of solution ×100
= [12g /(12g +160g)]×100
6.97%
solution is 6.97% concentrated.
2.
• percentage of solution =5
• Mass of solution = 250g.
• = Mass of solute /250×100.
• = 5×250/100.
• = 12.5g
• (b) Dispershed phase - the solute like component in a colloid form the dispersed phase
• Dispersed medium- the component in which the Dispersed phase is suspended is the Dispersed medium.
3. formula percentage volume by volume:
% volume/volume= volume of solute
(cm3)volume of solution ( cm3) ×100
1ml = 1cm 3
Give data:
volume of solute= 5 cm 3
volume of solution= 5+95 = 100 cm3
SOLUTION:
%volue/volume = volume of solute
(cm20/volume of solution (cm3) ×100
= 5cm 3 /100cm 3× 100
= 0.05 × 100
= 5%
The percentage volume by volume is 5%
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