Quick questions on Concentration units, acids and bases, and pH: VCE Chemistry Unit 2

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are concentration units?

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Pick the unit that matches the question's data:

What is the Brønsted-Lowry model?

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A Brønsted-Lowry acid is a proton donor; a Brønsted-Lowry base is a proton acceptor. An acid-base reaction is a proton transfer:

What is pH?

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where [H+] is in mol L^-1. For pure water at 25 deg C, [H+] = 10^-7 mol L^-1 and pH = 7.

What is q1?

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Calculate the pH of a solution prepared by diluting

25.0 \, \text{mL}

0.100 \, \text{mol/L}

HCl to

250 \, \text{mL}

with water. [2 marks]

What is q2?

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A water sample contains

5 \, \text{ppm}

of calcium ions. (a) Express this in

\text{mg/L}

and

\text{mol/L}

. (b) Explain why

1 \, \text{ppm}

approximates

1 \, \text{mg/L}

for dilute aqueous solutions.

What is q3?

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A swimming pool contains

50{,}000 \, \text{L}

of water at pH

8.4

. (a) Calculate

[\text{H}^+]

and

[\text{OH}^-]

. (b) Determine moles of

\text{HCl}

needed to lower the pH to

7.4

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