Milk of magnesia is used for treatment of acidity in stomach, its formula is:
Correct answer: A. Mg(OH)2
- A. Mg(OH)2
- B. MgSO4
- C. Ca(OH)2
- D. CaSO4
Explanation
Milk of magnesia is a suspension of magnesium hydroxide, with the chemical formula Mg(OH)2. It is an effective antacid that neutralizes stomach acid, providing relief from heartburn and indigestion. The reaction with stomach acid produces magnesium chloride and water, which reduces acidity. The other options, MgSO4, Ca(OH)2, and CaSO4, either have different uses or are not suitable for treating stomach acidity.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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About pH and pOH
pH measures hydrogen ion concentration and pOH measures hydroxide ion concentration on a logarithmic scale. Calculations use pH = minus log of hydrogen ion concentration, pOH = minus log of hydroxide ion concentration and pH plus pOH equals pKw, with separate treatment of strong and weak acids and bases.
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