AC- Molarity and analysis

equations,mole ratios,molality ,normality

What is Molarity ?

Molarity is a way of expressing the concentration of a solution.

What are moles and why do we need them ?

why-can’t count individual atoms or molecules

what - unit of measurement that equals avogadro’s number of that particular element/compound

Avogadro’s number= 6.022×1023 particles

What equation do we use to find the number of moles ?

moles = mass (g) /Molar mass (g/mol)

What is the equation for molarity ?

1L = 1000ml = 1,000,000 microl

1L = 1 dm3

Concentration ( mol/L) = moles(mol)/volume (L) 

What equation do you use when you dilute a sample?

note- the amount of moles stay the same

so therefore

C (final )= c ( initial )x v( initial)/v (final)

What is the general equation for ratio reactions in the liquid phase ?

A X  + B Y  = Product

A(C_X x Vx) = B(C_Y x Vy)

where:

A = the number 

B= the number 

What is Molality?

Molality (m) is defined as the number of moles of solute per kilogram of solvent (mol/kg).

What is normality ?

•Normality (N) is defined as the number of moles equivalents per litre  (eq/L).

-specifically only used for acids and bases

-calculated by the amount of h+ or oh-