Quick questions on Colorimetry, UV-visible spectroscopy and AAS: VCE Chemistry Unit 2

3short 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 q1?

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State the wavelength chosen for analysis in UV-vis spectroscopy and explain why this choice gives the most accurate result. [2 marks]

What is q2?

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Four copper standards of

1.00, 2.00, 4.00

and

6.00 \, \text{ppm}

give absorbances of

0.085, 0.170, 0.340

and

0.510

. A sample reads

0.255

. Calculate the copper concentration in the sample.

What is q3?

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A water sample is analysed by AAS for zinc. The dilution factor is

\times 10

; the cuvette absorbance is

0.220

on a calibration with slope

0.044 \, \text{ppm}^{-1}

. (a) Calculate cuvette

[\text{Zn}]

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