Chemistry · Oct / Nov 2022 · Paper 62 · Question 4
0620
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The question as text
Hydrogels are powders that absorb water to form hydrated solids. Hydrogels and the hydrated solids formed are insoluble in water. Plan an investigation to find which hydrogel, hydrogel A or hydrogel B, is able to absorb the greater mass of water. You are provided with samples of hydrogel A, hydrogel B, water and common laboratory apparatus. [6]
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any 6 from
mass increase method
MP1 known / stated / find mass of hydrogel
MP2 repeat experiment for second hydrogel
MP3 add excess water
MP4 stir / mix with water
MP5 filter (to obtain solid hydrogel / excess water)
MP6 weigh hydrogel
MP7 mass of water absorbed = final mass – initial mass
OR
add gradually method
MP1 known / stated / find mass of hydrogel
MP2 repeat experiment for second hydrogel
MP3 add water gradually to hydrogel
MP4 stir / mix
MP5 until no more absorbed
MP6 find mass of hydrated hydrogel
MP7 mass of water absorbed = final mass – initial mass
max 6
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