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QLDChemistryQuick questions

Unit 2: Molecular interactions and reactions

Quick questions on Concentration and dilution of aqueous solutions (QCE Chemistry Unit 2)

5short 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 is solution stoichiometry?
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Solution stoichiometry uses the same mole map as gas stoichiometry, with V x c replacing V_m or PV/(RT) at the solution end.
What is serial dilution?
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A serial dilution is a sequence of dilutions, each one applied to the previous result. The total dilution factor is the product of the individual dilution factors.
What is q1?
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Calculate the concentration in mol L−1\text{mol L}^{-1} when 2.50 g2.50 \, \text{g} of NaOH\text{NaOH} (M=40.00M = 40.00) is dissolved in 250 mL250 \, \text{mL} of water. [3 marks]
What is q2?
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25.0 mL25.0 \, \text{mL} of 0.500 mol L−10.500 \, \text{mol L}^{-1} HCl is diluted to 250 mL250 \, \text{mL}. Calculate the final concentration. [3 marks]
What is q3?
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A student must prepare 250 mL250 \, \text{mL} of 0.100 mol L−10.100 \, \text{mol L}^{-1} KMnO4\text{KMnO}_4 from solid. (a) Calculate the mass needed. (b) Describe the volumetric procedure.

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