Question

1. identify all the examples of a base according to the table below. h⁺ ph example acids 1 x 10⁰ 0 hcl 1 x 10⁻¹ 1 stomach acid 1 x 10⁻² 2 lemon juice 1 x 10⁻³ 3 vinegar 1 x 10⁻⁴ 4 soda 1 x 10⁻⁵ 5 rainwater 1 x 10⁻⁶ 6 milk neutral 1 x 10⁻⁷ 7 pure water bases 1 x 10⁻⁸ 8 egg whites 1 x 10⁻⁹ 9 baking soda 1 x 10⁻¹⁰ 10 tums antacid 1 x 10⁻¹¹ 11 ammonia 1 x 10⁻¹² 12 mineral lime ca(oh)₂ a) hydrochloric acid b) sodium hydroxide c) water d) ammonia e) yogurt

Explanation:

Step1: Recall pH - based classification

Acids have pH < 7, neutral substances have pH = 7, and bases have pH > 7.

Step2: Analyze each option

• A) Hydrochloric Acid (HCl) has a low pH (as shown in the table for acids), so it is an acid.
• B) Sodium Hydroxide (NaOH) has a high pH (as seen in the bases section of the table), so it is a base.
• C) Water has a pH of 7, so it is neutral.
• D) Ammonia has a high pH (as in the bases part of the table), so it is a base.
• E) Yogurt is acidic (not shown in table but known), so it is an acid.

Answer:

B. Sodium Hydroxide, D. Ammonia