Question

acids & bases
think about the ph scale. the numbers listed below
are the ph of each substance.
which of the following are considered acids?
(select all that apply.)
pure water - 7.0
lemon juice - 2.5
ammonia - 11.6
eggs - 7.8
vinegar - 4.0
soft drink - 2.9
baking soda solution - 8.5
tomato juice - 5.1
ketchup - 3.8
unknown solution - 1.3

Explanation:

According to the pH scale, substances with a pH less than 7 are acidic. We check each option's pH value:

• Pure water has a pH of 7.0 (neutral).
• Lemon juice has a pH of 2.5 (<7, acidic).
• Ammonia has a pH of 11.6 (>7, alkaline).
• Eggs have a pH of 7.8 (>7, alkaline).
• Vinegar has a pH of 4.0 (<7, acidic).
• Soft drink has a pH of 2.9 (<7, acidic).
• Baking soda solution has a pH of 8.5 (>7, alkaline).
• Tomato juice has a pH of 5.1 (<7, acidic).
• Ketchup has a pH of 3.8 (<7, acidic).
• Unknown solution has a pH of 1.3 (<7, acidic).

Answer:

lemon juice - 2.5, vinegar - 4.0, soft drink - 2.9, tomato juice - 5.1, ketchup - 3.8, unknown solution - 1.3