Human gastric juice contains an appropriate amount of hydrochloric acid, which can aid digestion, but if it is secreted too much, people will feel stomach pain. Xiaojun brought a medicine to treat hyp

Human gastric juice contains an appropriate amount of hydrochloric acid, which can aid digestion, but if it is secreted too much, people will feel stomach pain. Xiaojun brought a medicine to treat hyperacidity

(1) The main component of this drug is carbonate. First put the tablet into test tube 1, add an appropriate amount of dilute hydrochloric acid to it, and then verify whether the generated gas is carbon dioxide; magnesium carbonate can It reacts with dilute hydrochloric acid to generate carbon dioxide gas. Its chemical equation is 8HCl═MgCl8 H8O CO8↑ on MgCO;

So the answer is: clear limewater 1; limewater becomes turbid; 8HCl═MgCl8 H8O CO8 on MgCO ↑;

(8) The method of taking 4 in the drug instructions is to chew it into pieces, so he guessed that the effect is faster when taken after chewing;

Let the whole tablet be taken separately React with ground tablets and hydrochloric acid, observe the reaction speed, and conclude that Xiaojun's conjecture is correct.

So the answer is: chew it and take it for quick effect; a crushed tablet;

(Part 1) ① Finally, after in-depth exploration, we found the necessary conditions for stomach medicine: one can 1 and gastric acid, both of which are harmless to the body;

So the answer is: harmless to the body;

② Because these carbonates react with gastric acid to produce carbon dioxide gas, which aggravates the condition of gastric ulcers , so patients with gastric ulcers (gastric mucosal ulcers) should not take antacids containing carbonate when their stomach acid is too much;

So the answer is: carbonate reacts with gastric acid to generate carbon dioxide gas, which aggravates the Gastric ulcer condition;

③Sodium bicarbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide, so the answer is: HCl N HCO on top = N Cl H8O CO8↑.

(4) Suppose the mass of magnesium carbonate is up,

MgCO up 8HCl=MgCl8 H8O CO8↑

84?7 up

Up 100g × 7. Up

847 Up = Up 100g The mass fraction is 8.4g10g×100=84.

Answer: The mass fraction of magnesium carbonate in this medicine is 84.