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Alexxx [7]
3 years ago
12

What is the molar mass of KCI

Chemistry
1 answer:
9966 [12]3 years ago
7 0

Answer:

178.01347 ± 0.00093 g/mol

Explanation:

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Determine the pH of a KOH solution made by mixing 0.251 g KOH with enough water to make 1.0 × 10 2 mL of solution
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Answer:

pH = 12.65

Explanation:

From the given information:

number of moles =mass in gram / molar mass

number of moles of KOH = mass of KOH / molar mass of KOH

number of moles of KOH =  0.251 g / 56.1 g/mol = 0.004474 mol

For solution :

number of moles = Concentration × volume

concetration = number of moles/ volume

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concetration  = 0.04474 M

We know that 1 moles KOH result into 1 mole OH⁻ ions

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Now,

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pOH = -log (0.04474) M

pOH = 1.35

Similarly,

pH + pOH = 14

pH = 14 - pOH

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