What in God's name is Normality?

[BrazilianRider]

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My exam's tomorrow so I'm going over my stuff and just saw this word I do not remember...

Is it N1V1=N2V2?

Like 1M of H2SO4 would be Normality = 2? Would 0.5M H2SO4 be Normality = 1? Would 3M Ca(OH)2 be Normality = 6?

My friend says it's grams/liters, but that literally makes no sense to me. Can someone please help!?

 

[integratethis]

It's equivalents per liter. Ie one mole of calcium hydroxide Ca(OH)2 has two equivalents of hydroxide ions. And then you can use stoichiometry to figure out whatever your calculating.

 

[Thanhn]

I was also confused by this because I never learned it this way in Gen Chem. When approaching a problem like this, I write out the neutralization equation and set up my dimensional analysis equation accordingly. It might take a little longer, but it'll definitely stop you from making a dumb mistake.

Example - 500mL of HCl of what molarity will neutralize 750mL of 2.0M Ca(OH)2.

2HCl + Ca(OH)2 --> 2 H2O + CaCl2
.75L Ca(OH)2 * (2.0 mol/L) * [2 mol HCl/ 1 mol Ca(OH)2] = 3 moles HCl / .500L = 6M HCl

 

[BrazilianRider]

The reason I'm asking is because he told me he was doing some practice problems and one of them asked him to calculate the normality, and he used grams/liters... I was so confused.

 

[Daneosaurus]

I never learned it this way in gen chem, either, but it does seem to work.

 

[integratethis]

Just go gram to mole like normal. And then moles to equivalents, just an extra conversion factor