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Chemistry · May / June 2020 · Paper 62 · Question 4

0620

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Many window-cleaning products contain aqueous ammonia. Aqueous ammonia is an alkali that reacts with dilute acids. Plan an investigation to find which of two window-cleaning products contains the most concentrated aqueous ammonia. Include in your plan: ● the method you will use ● how your results will be used to determine which window-cleaning product contains the most concentrated aqueous ammonia. You are provided with an aqueous solution of the two window-cleaning products, dilute hydrochloric acid of known concentration and common laboratory apparatus. [6]

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Any six from:

stated / equal volumes of each cleaner
measured with pipette / measuring cylinder / burette into a beaker or flask
named indicator added
add hydrochloric acid
from a burette
until indicator changes colour
record / calculate volume acid added
biggest volume of acid is most concentrated
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