To prepare different concentration of phosphoric acids

By dilution, eg using 85% conc(w/w) phosphoric acud

From Steffen's density table(short version):

Molar mass of phosphoric acid is 98

Molarity1 * volume 1 = molarity2 * volume 2 (mole concept )

Density1*conc1* vol1= density 2*conc2*vol2 ( mass concept)

Density * conc(%)/ molar mass = molarity(no. Of moles per litre )

Some worked example:

From my excel

Normality:

The normality of a solution is the molarity multiplied by the number of equivalents per mole.

eg 3N of KCL solution = 3g of KCL solids / 1 litre of solution 

But for H3PO4 phosphoric acid, number of equivalents per mole is 3

So normality of H3PO4 phosphoric acid = 14.68*3= 44

Reference :

Sigma aldrich calculator ( conc in molar or normal)

aqion de calculator. DO NOT download!!! Has reputation virus

Chembuddy

Homebrewtalk Silver_is_money is correct , who likes to think in gram instead of mole