pH, Acids & BasesATI TEAS 7 cheat sheet

The 0–14 scale

8 key facts 3 practice questions Reviewed Oct 2026

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The Scale

0–6 acidic, 7 neutral, 8–14 basic (alkaline)
Each whole number is a 10-fold change in H⁺
pH 4 is 100× more acidic than pH 6

Acids

Release H⁺; taste sour; turn litmus red
Stomach acid ≈ pH 1.5–3.5

Bases

Release OH⁻; feel slippery; turn litmus blue
Blood is tightly held at 7.35–7.45

Buffers

Resist pH change by soaking up extra H⁺ or OH⁻

Key takeaway

The 0–14 scale

Before you read

Test yourself first: 3 questions

Question 1 of 3

A base will turn red litmus paper:

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