Concentrations

Question 1

Solution

Answer 1

A homogeneous mixture containing one or more solutes in a solvent. The solvent makes up most of the solution, whereas a solute is the substance that is dissolved inside a solvent.

Question 2

Concentration

Answer 2

Indicates the amount of the substance present in a mixture.

Question 3

Mass percent

Answer 3

= mass of solute (grams) / mass of solution(grams) x100

Question 4

Volume percent

Answer 4

= volume of solute(mL)/ volume of solution(mL)x100

Question 5

Mass/volume percent

Answer 5

= mass of solute (g) I volume of solution (mL) x100

Question 6

Mass per unit volume

Answer 6

= mass of solute (grams)/ volume of solution(mL)

Question 7

Mole fraction

Answer 7

= no. Moles substance A/ total number of moles

Question 8

Mole percent

Answer 8

= no.moles substance A/total no. Moles x 100

Question 9

Molarity

Answer 9

= moles of solute /volume of solution (L)

Question 10

Molality

Answer 10

= moles of solute / mass of solution(kg)

Question 11

Parts per million

Answer 11

1g solute in 1000000ml, 1mg in 1L solution

Question 12

Parts per billion

Answer 12

1g solute in 1,000,000,000ml, 1microgram solute in 1L solution

Question 13

Parts per trillion

Answer 13

1g solute in 1,000,000,000,000ml, 1ng solute in 1L solution

Question 14

Calculating concentration formulas

Answer 14

C1 x V1 = C2 x V2
C= n/v
n= m/Mr
C= mass(g)/volume(L)= g/L
C%= mass(g)/volume(L) x 100=%m/v
C= moles/volume(L)=moles/L