States of Matter and Water (Chemistry)

Pressure varies - The boiling point of a liquid is the temperature at which its vapor pressure equals the surrounding atmospheric pressure.

Therefore, as the pressure changes, the boiling point also changes. For instance, water boils at a lower temperature at higher altitudes where the atmospheric pressure is lower.

Volume of gases - An eudiometer is a laboratory apparatus used to measure the volume of gases produced or consumed in a chemical reaction.

Pure Water - Pure water is considered neutral and has a pH value of 7 at 25∘C.Sulfuric acid is a strong acid (pH < 7), sodium carbonate is a basic salt (pH > 7), and hydrochloric acid is a strong acid (pH t< 7).

Pure water has a pH of 7. The pH value is actually a measure of the concentration of hydrogen ions in a liquid, by which the acidity or alkalinity of a liquid is checked.

Liquids with a pH value less than 7 are acidic and liquids with a pH value greater than 7 are alkaline in nature. The pH value of water is 7 which means that it is a neutral liquid, but only for pure water this value is approximately equal to 7.

Equal to 7 - The pH scale ranges from 0 to 14, with 7 being the neutral point. Values below 7 indicate acidic solutions, and values above 7 indicate basic (or alkaline) solutions.

7 - The pH of pure water at 25∘C is 7, which signifies its neutral nature.

Below 7.0 - Acidic substances have a pH value less than 7. The lower the pH value, the stronger the acid.

Potenz - The 'p' in pH stands for 'Potenz', which is German for 'power' or 'potential', referring to the power of hydrogen ion concentration.

Acidic - A pH value of 4 is below 7, indicating that lemon juice is acidic.

Concentrated Hydrochloric Acid (HCl) - The pH scale ranges from 0 to 14, with lower values indicating higher acidity. Concentrated hydrochloric acid is a strong acid and will have a pH value closest to zero among the given options. Baking soda is basic (pH > 7), ammonia is also basic (pH > 7), and pure water is neutral (pH = 7).