Question

0.50 g of sodium hydroxide (NaOH) pellets are dissolved in water
to make 6.0 L of solution. What is the pH of this solution?
**Express the pH numerically to two decimal
places.**

Answer #1

mass of NaOH = 0.50 g

molar mass of NaOH = 40 g/mol

moles of NaOH = mass / molar mass

= 0.50 / 40

= 0.0125

volume = 6.0 L

molarity = moles / volume

= 0.0125 / 6.0

= 2.08 x 10^-3 M

[OH-] = 2.08 x 10^-3 M

pOH = -log [OH-] = -log ( 2.08 x 10^-3 )

pOH = 2.68

pH + pOH = 14

**pH = 11.32**

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0.75 g of hydrogen chloride (HCl) is dissolved in water to make
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Express the pH numerically to two decimal places.
pH =
Part B
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Express the pH numerically to two decimal places.
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The temperature for each solution is carried out at
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Express the pH numerically to two decimal places
part C
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