Define pH? What is the pH of 0.2M at HCL at 25C?
Answers
Answer:
negative log h+ ion concentration is known as ph
for strong acids
ph = - log 0.2
= 1.60
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Answer:
The pH of 0.2 M of HCl at 25°C is 0.698
Explanation:
pH value: It is a value of a compound/substance which tells about how much acidic the compound/substance is or how much alkine the compound is.
- It is measured on a logarithmic scale with base 10.
- If the value of pH is 7, then it is neutral.
- If the pH value is less than 7 then the compound is acidic.
- If the pH value is more than 7 then the compound is alkiine in nature.
pH value can be mathematically formulated as, negative of the log of concentration of H⁺ ions present in the compound.
⇒ pH = -log([H⁺])
Calculation,
As concentration of HCl molecule given is [HCl] = 0.2 M
But we know that,
HCl(aq) → H⁺(aq) + Cl⁻(aq)
Hence, the concentration of H⁺ ions is 0.2 M.
⇒ pH = -log(0.2)
⇒ pH = 0.698, it is acidic in nature.
Therefore, the pH of 0.2 M of HCl at 25°C is 0.698
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