Antacid capacity can be compared as millimoles of $H X^{+}$ neutralised per gram of solid (Mg = 24, Al = 27, Ca = 40, Na = 23, C = 12, O = 16, H = 1; each hydroxide ion or carbonate ion/hydrogencarbonate ion reacts completely). Which solid has the highest capacity per gram?

A $CaCO X_{3}$
B $Mg (OH) X_{2}$
C $Al (OH) X_{3}$
D $NaHCO X_{3}$

Answer: C

Capacity = (H+ per formula unit) x 1000 / molar mass. Al(OH)3: 3/78 gives 38.46; Mg(OH)2: 2/58 gives 34.48; CaCO3: 2/100 gives 20.00; NaHCO3: 1/84 gives 11.90 mmol/g. Aluminium hydroxide is highest.

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Antacid capacity can be compared as millimoles of HX+ neutralised per gram of solid (Mg = 24, Al = 27, Ca = 40, Na = 23, C = 12, O = 16, H = 1; each hydroxide ion or carbonate ion/hydrogencarbonate ion reacts completely). Which solid has the highest capacity per gram?

Answer: C

More questions on Antacids, antihistamines, analgesics, antibiotics

Antacid capacity can be compared as millimoles of $H X^{+}$ neutralised per gram of solid (Mg = 24, Al = 27, Ca = 40, Na = 23, C = 12, O = 16, H = 1; each hydroxide ion or carbonate ion/hydrogencarbonate ion reacts completely). Which solid has the highest capacity per gram?