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Dear experts I want to make potash alum from scrap aluminium foil. Please look at the following procedure that i have found on the internet and answer the questions that follows . ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Procedure

? Clean a small piece of scrap aluminium with steel?

wool and cut it into very small pieces. Aluminium?

foil may be taken instead of scrap aluminium.

? Put the small pieces of scrap aluminium or?

aluminium foil(about 1.00g) into a conical flask and?

add about 50 ml of 4 M KOH solution to dissolve?

the aluminium.?

? The flask may be heated gently in order to facilitate?

dissolution. Since during this step hydrogen gas is?

evolved this step must be done in a well ventilated?

area.?

? Continue heating until all of the aluminium reacts.

? Filter the solution to remove any insoluble?

impurities and reduce the volume to about 25 ml by?

heating. ? ? ? ? ? Allow the filtrate to cool. Now add slowly 6 M?

H2SO4 until insoluble Al(OH)3 just forms in the?

solution.

? Gently heat the mixture until the Al(OH)3?

precipitate dissolves.?

? Cool the resulting solution in an ice-bath for about?

30 minutes whereby alum crystals should separate?

out. For better results the solution may be left?

overnight for crystallization to continue.?

? In case crystals do not form the solution may be?

further concentrated and cooled again.

? Filter the crystals from the solution using vacuum

pump, wash the crystals with 50/50 ethanol-water?

mixture. ? Continue applying the vacuum until the crystals?

appear dry.

? Determine the mass of alum crystals. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?#Respected experts please tell me 1)how shall i make 50 ml of 4M KOH solution ? If i add 11.22 gram of KOH pellets in 50ml of water will it do ? If not please elaborate each step clearly on how i can make it . ? ? ? 2) after filtering the solution of aluminium and koh how am i supposed to reduce it to?25.ml?... am i supposed to reduce it by heating ? ?3) how shall i make 6 M of h2so4 solution .... the procedure doesn't provide me with the amount of solution to be prepared in milli literes . Please tell me how i can make it . ? ? ? Last time i followed this procedure my crystals were not formed . I have to make this investigatory project as soon as possible so please help . My teacher said the koh pellets are very expensive , i have wasted them once and i need them to be perfect this time . Also how long am i supposed to keep the solution fir it to make the crystals ?
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