concentrations

From the practical sessions

what is the general equation for concentration?

concentration = amount of solute / amount of solution

what is the equation of W/W%

The equation is; w/w% = mass of solute / mass of solution x 100 (units must be in mg, g or kg)

what is the definition of w/w%

how many grams of solute we have in 100g of solution

what is the equation for v/v%

v/v% = volume of solute / volume of solution x 100

what is the definition of v/v%

how many ml of solute we have in 100ml of solution

what is the equation for w/v% 

w/v% = mass of solute (g) / volume of solution (ml) 

must be in g and ml no other units 

what is the definition of w/v

how many grams of solute is in 100 ml of solution

how do you calculate the number of moles? (general equation) 

n = m / mw (moles = mass divided by molar mass) 

what’s the symbol for molarity ?

c

what’s the definition of molarity? 

amount of moles of solute present in 1 litre of solution 

for molarity what does a larger number of moles mean for the concentration of the solution?

means the solution is more concentrated

what’s the unit for molarity?

mol / L

what is the symbol for molality? 

Cm or sometimes just m

what is the def for molality?

how many MOLES of solute are present in 1KG of SOLVENT

What is the equation for molality? 

molality (Cm) = moles of solute / mass of solvent 

Cm = nsolute / msolvent 

does molality change with temperature?

no

what’s the symbol for normality?

C_N or just N

what’s the def of normality?

how many equivalent parts of solute are in 1 litre of solution

what’s the equation for normality? 

N = moles of equivalent parts / volume of solution in litres 

what are equivalent parts?

basically a reaction unit - which is the amount of a substance that can;

provide OR react with 1 mole of H+ or OH-

so equivalent parts = how many of those reaction units you have