Write down the name of alkali which is used to balance the ph of human stomach

Calcium hydroxide.

Explanation:

The gastric juice is a solution of hydrochloric acid. It is highly acidic. Antacids contain basic chemicals that could neutralize that acid.

If the active ingredient in an antacid medication is a metal hydroxides ("alkalis,") it is likely to be calcium hydroxide . Compared with other metal hydroxides, is superior in multiple ways.

and rapidly dissolve in water to produce a strongly basic solution. In contrast, the solubility of calcium hydroxide in pure water is relatively low. That means that there's a lower chance for antacids based on calcium hydroxide to irritate the mouth and throat while being swallowed.

Hydroxides of toxic "heavy" transition metals, such as copper (II) hydroxide, are even weaker than calcium hydroxide. However, when these alkalis react with the HCl in gastric juice, they release their toxic metal cations. As a result, these alkali are seldom used in antacids. In contrast, calcium occurs naturally in many dairy products and is not as toxic.

Magnesium hydroxide is weaker than calcium hydroxide and is also not toxic. However, since the magnesium ion is a potential laxative, it is not as frequently used as calcium hydroxide in antacids.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."