Question

Gastric juice contains 3.65 g of HCl per litre. If a person produces 2.0 L of gastric per day how many antacid tablets, each containing 520 " mg of " `Al(OH)_3`, are needed to netralise all the HCl produced in one day?

Answer 1

Strength`=NxxEw(Mw=Ew of HCl=36.5g)`
`N_(HCl)=("Strength")/(Ew)=(3.65)/(36.5)=0.1N`
m" Eq of "HCl`=NxxV(mL)=0.1xx2000mL`
`=200mEq`
`HCl-=Al(OH)_3`
`mEq-=mEq`
`200mEq-=("Weight")/(Ew)xx10^(3)`
`{:(Mw of Al(OH)_3=27+3xx17=78),(Ew=(Mw)/(3)=(78)/(3)):}`
`200=("Weight"xx10^(3))/((78)/(3))`
Weight of `Al(OH)_3=(200xx78)/(1000xx3)=5.2g=5200mg`
Number of tablets of `Al(OH)_3=(5200)/(520)=20`