Question

${H_2}S$ is acidic while water is neutral why?

Answer 1

The chemical compound hydrogen sulphide has the chemical formula ${H_2}S$ . The gas is colourless and has a strong rotten egg stench. It is a deadly, caustic, and combustible gas. Hydrogen sulphide is mostly employed in the industrial sector.

Complete Step By Step Answer:
The size of the central atom ${H_2}S$ is larger than that in ${H_2}O$ . $S - H$ bond is larger and weaker than $O - H$ bond ${H_2}O$ , hence ${H_2}S$ is more acidic than ${H_2}O$ .
Because oxygen does not release ${H^ + }$ ions readily and because oxygen molecules are small, the bond strength is high, this is also why oxygen does not release ${H^ + }$ ions. However, because ${H_2}S$ bond strength is weak, it releases ${H^ + }$ ions and has an acidic nature, but ${H_2}O$ does not have an acidic character.
As the concentration of hydrogen and hydroxide ions in water is the same, it is called neutral. In nature, chemical species with a pH value between $0$ and $7$ are termed acidic.
Neutral substances are chemicals that have no properties of either acids or bases, have equal parts hydrogen and hydronium ions and don't change the colour of litmus paper or other acid-base indicators. Neutral substances include water, glucose solutions and salt solutions. These chemicals have a pH of $7.0$ on a scale of $14$ .

Note:
Simply looking at a substance does not reveal whether it is acidic, basic, or neutral. Acidic compounds have a sour taste; however, markers can be used to determine their type. Litmus paper, phenolphthalein, methyl orange, and other indicators are available. Distinct compounds have different effects on indicators, which allows them to be identified.