Chemistry Question. Need help thanks.
Brand A is a type of antacid tablet which contains calcium carbonate. Brand B contains magnesium hydroxide. Further, Brand A should be chewed before swallowing.
a) Suggest an explanation why Brand B is preferred to Brand A.
b) Why Brand A should be chewed before swallowing?
c) Sodium hydroxide is a common alkali. Why it is not commonly used in antacids?
About Antacid tablets
2006-12-08 5:15 am
回答 (3)
2006-12-08 5:55 am
✔ 最佳答案
A)Calcium carbonate in brand A when react with HCl in stomach will form CO2(g) which accumulate in stomach thus causing an unwell feeling.B)To increase the surface area so that more calcium carbonate will be exposed to HCl when reaching stomach for faster reaction rate so that concentration of HCl in stomach will decrease in a higher rate.
C)It is a strong alkali which may overconsume HCl in stomach so that strengh of immunity of human(First line of defence) will be greatly reduced.
參考: F.7 Biology + Chemistry knowledge
2006-12-16 1:56 am
雖說你的很好，但B的答案可能有問題……
因為還有另一個原因！
When calcium carbonate react with HCl, the reaction will stop because a layer of protection(CaCl) will form on the surface of calcium carbonate.
Chewing is to prevent the reaction stop because of this.
This will happen because CaCl cannot dissolve in water easily!
因為還有另一個原因！
When calcium carbonate react with HCl, the reaction will stop because a layer of protection(CaCl) will form on the surface of calcium carbonate.
Chewing is to prevent the reaction stop because of this.
This will happen because CaCl cannot dissolve in water easily!
2006-12-08 5:47 am
a) A produced CO2 with acid.
b) no idea
c) Strong neutralization release amount of heat.
b) no idea
c) Strong neutralization release amount of heat.
收錄日期: 2021-04-12 21:26:23
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