Expression of Concentration Flashcards
9-10 lesson
1
Q
how to express percent as decimal/whole number
A
percent /100
2
Q
percent weight in volume
A
%w/v =g/100mL
volume x decimal = weight
3
Q
percent volume in volume
A
%v/v = mL/100mL
volume x decimal = mL
4
Q
percent weight in weight
A
%w/w = g/100g
weight x decimal = weight
5
Q
how to find ratio strength with %
A
5% means 5 parts per 100 therefore 5:100 reduced to 1:20
6
Q
ratio strength equation
A
g of given solute / mL of given solution = 1/X where the ratio is 1:X
7
Q
how to express a ratio to a % strength
A
total parts / 1 part = 100% / X%
8
Q
how to convert % strength to ratio
A
% strength / 100% = 1 part / x parts; 1:X is ratio
9
Q
ppm
A
parts per million
10
Q
how to express ppm in ratio and ratio strength
A
5ppm is 5 parts in 1,000,000 parts
5:1,000,000 - reduces to 1:200,000 (ratio)
1/200,000 = x%/100% = 0.0005%
