chemistry1

a)
Mole ratio NaOH : HCl = 1 : 1
No. of moles of NaOH = 0.01 x (60.5/1000) = 0.000605 mol
No. of moles of HA = 0.000605 mol
Molar mass of HA = 0.543/0.000605 = 897.5 g/mol


b)
HA + NaOH → NaA + H2O

2011-11-24 22:13:22 補充：
HA is a monobasic acid. HA may be or may not be HCl, because HCl is one of the monobasic acids..

2011-11-24 22:13:30 補充：
HA is a monobasic acid so that 1 mole of HA contains one mole of ionizable hydrogen ions, while 1 mole NaOH can be ionized to give 1 mole of hydrogen ions. Since one mole of hydrogen ions can neutralized by one mole of hydroxide ions, thus we know the mole ratio of HA : NaOH = 1 : 1

2011-11-26 16:38:15 補充：
You may also read the equation in part b). The coefficient of HA is 1 and that of NaOH is also 1. Therefore, the mole ratio HA : NaOH = coeficients in equation HA : NaOH = 1 : 1