Would you expect something with a pH of 4 to be more or less acidic than human blood?

Answer: More Acidic

Explanation:

The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline).

Human blood usually has a pH of 7.40 so it is leaning more on the basic side of the pH scale (since the middle of the scale is at 7.0)

A pH of 4 is closer to 0 so that means it is pretty acidic

The acidity or alkalinity (base) of the body can be measured through blood, urine or saliva. but

When the pH is 7, it is considered neutral. When a substance has a pH greater than 7 esalkaline, and is acidic if it is lower than that value. The ideal pH for our body is between 6 and 6.8. Any value greater than 6.8 is considered alkaline.