When the hydrogen ion concentration changes by a factor of 1000, the value of pH of the solution

Question

When the hydrogen ion concentration  changes by a factor of 1000, the value of pH of the solution

Canvas Classes · Accepted Answer

Definition:

Step 1 — Effect of 1000-fold change in :

If  increases by factor 1000:

So pH decreases by 3 units.

Step 2 — Verify:
If  goes from  to  (×1000), pH goes from 7 to 4  decrease of 3 ✓

Answer: Option (2) — Decreases by 3 units

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