What is the molarity of phosphoric acid?
The molar mass of phosphoric acid is 97,99 g.
What volume of 0.200 molarity phosphoric acid will react completely with 50ml of 0.100 molarity sodium hydroxide?
Phosphoric Acid dissociates to give off 3H+ ions, meaning that one mole of Phosphoric acid reacts with three mols of sodium hydroxide. Using the equation n = c x v n = 0.1 x 0.05 =0.005 mols of OH ions in the solution therefore there are 0.005/3 = 0.00167 So the volume of phosphoric acid - v = n/c v = 0.00167/0.2 v = 0.00835 l = 8.4ml of Phosphoric Acid reacts completely with Sodium…
this means 0.6gm of phosphoric acid in 1000gm of water --------------------------------------- (the previous answer describes a mass percent) It means a 0.6 molal phosphoric acid (i.e. 0.6 mol hydrogen phosphate in 1 kg of water, which is roughly equivalent to 0.6 M phosphoric acid), though molality (mol/kg) is rarely used to denote concentration of acids. More common units are molarity M (mol/L) or normality n (mol/L of hydrogen ion generated).
Phosphoric acid has the formula H3PO4 so if you add up these numbers from the periodic table you find the Molar mass of phosphoric acid is 98 (1+1+1+31+16+16+16+16). this is the mass (in grams) of one mol of phosphoric acid (or 6.02 x 10^23 atoms of phosphoric acid) So times this number by 0.4 to find the mass of 0.4mol of phosphoric acid=39.2 grams