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Basile [38]
2 years ago
14

An HCl solution has a concentration of 9.8 x 10-5 M. What is the pH of this solution?

Chemistry
1 answer:
Inessa05 [86]2 years ago
7 0
HCl = H⁺ + Cl⁻

c(HCl)=9.8*10⁻⁵ mol/l

pH=-lg[H⁺]

[H⁺]=c(HCl)

pH=-lg{c(HCl)}

pH=-lg{9.8*10⁻⁵}=4.009

pH=4.009
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Explanation:

We can determine the nature of the solution via determining which has the large no. of millimoles (acid or base):

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  • We need to calculate the no. of millimoles of acid and base:

no. of millimoles of acid (HNO₃) = MV = (1.3 M)(75.0 mL) = 97.5 mmol.

no. of millimoles of base (NaOH) = MV = (6.5 M)(150.0 mL) = 975.0 mmol.

<em>∴ The no. of millimoles of base (NaOH) is larger by 10 times than the acid (HNO₃).</em>

<em>So, the solution is: basic.</em>

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2 years ago
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