I never heard of Normality is it really a subject or something (apart of chemisrty)?

Question

They say this is normality. Can u teach me? Calculate the number of milliliters of solution required to provide 12.5 g of calcium hydroxide, Ca(OH)2, from 1.10-N calcium hydroxide solution in reactions that replace both hydroxide ions.

Answer 1

Normality is one of concentration units
Normality definitions is the number of equivelants of solute dissolved in one lettre of solution (gram equivlants per littre)
N=eq.wt/volume of solution per littre

there is a famouse rule for calculation wt

wt=N*v*eq.wt/(1000)
note:"if u need to drive this low tell me"

from the above rule
we know
wt=12.5 g
N=1.1
and eq.wt = Molecular weight /valency
since we get the structure Ca(OH)2 so it is easy to calculate
Molecular weight=40+[2*(16+1)]=74
equilvalnt weight =74/2=37

now
by applying the above rule
wt=N*v*eq.wt/(1000)
12.5=(1.1*v*37) / 1000
so
v=12.5*1000/(1.1*37)=307.125 ml

Answer 2

Normality refers to the concentration of reactive groups available in a solution. So, if a molecule has two, Normality is twice Molarity. Calcium Hydroxide has two -OHs per molecule, so if the solution is 1.10 N, it is 0.55M. Take it from there.

Answer 3

Normality is a concept that has not been taught in UK schools for at least 30 years, and it is also totally absent from the chemistry departments of UK universities. So goodness knows why it is still being taught in other parts of the world! Molarity and the necessary mole ratio in any reaction are all that are required.

Answer 4

Normalitiy is not a subject it is an equation used to find the normality (simliar to molarity)

equation: volume (1) * concentration (2) = volume (2) * concentration (2)

(1) primary standards (pure, stable) ex. oxalic acid, sodium carbonate
(2) secondary standards ex. HCL or NAOH

hope u benefit

Answer 5

Normality is defined as the number of equivalent weight of a substance present in one litre of solution. Equivalent weight of a substance is the amount of that substace which combines with or displaces one gram of hydrogen. for example, hydrochloric acid, molecular wt is equel to its equivalent wt.

tell you more later.

Answer 6

it is no. of equivalents per volume