Q1
A solution with pH 7 is:
Aneutral
Bstrongly acidic
Cstrongly basic
Dundefined
CBSEClass 10 (CBSE)ScienceCh 2 · Topic 2
The pH Scale and Salts
Learning about the pH scale and the formation of salts through neutralisation.
Core concept
pH is measured using indicators like universal indicator (which shows a range of colours) or precise instruments like a pH meter. Human blood maintains a slightly basic pH of about 7.4, and even small deviations can be dangerous, showing why pH regulation matters biologically. Salts, formed from neutralisation, are classified based on their source acid and base: a salt from a strong acid and strong base (like NaCl from HCl and NaOH) is neutral, while a salt from a strong acid and weak base tends to be acidic, and vice versa.
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• pH scale: 0-14; below 7 = acidic, 7 = neutral, above 7 = basic.
• Neutralisation: acid + base → salt + water, resulting in a neutral (or near-neutral) solution.
• Human blood maintains a pH of about 7.4; small deviations can be dangerous.
• Salt type depends on its parent acid/base: strong+strong = neutral salt, others vary.