Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Arrange the given list of substances in descending order of their pH.
Water, Sodium hydroxide, Vinegar, Gastric juices

• A. Sodium hydroxide > Vinegar > Gastric juices > Water
• B. Sodium hydroxide > Water > Vinegar > Gastric juices
• C. Gastric juices > Water > Vinegar > Sodium hydroxide
• D. Sodium hydroxide > Gastric juices > Water > Vinegar

Answer 1

The correct option is B Sodium hydroxide > Water > Vinegar > Gastric juices

pH value of a substance tells us how much acidic or alkaline a given substance is.
Water is a neutral solution, so its pH is likely to be 7. Sodium hydroxide is a strong base with pH of about 14 and gastric acid has pH of about 1. Vinegar is an aqueous solution of a weak acid called acetic acid with a pH approximately equal to 3.
Therefore the correct decreasing order of the pH of the given substances is:
Sodium hydroxide > Water > Vinegar > Gastric juices