Help I don’t get the part where they multiplied the moles of HCL by 250/21.30 to get moles of amino acid
The titration gives the moles of amino acid in 21.30 cm3 But you need to know the moles in 250ml, because the original solution was made up in a 250 cm3 volumetric flask. So you must multiply the moles (or mass) by 250/21.30