This is from my hydrolysis of salts and pH of buffet solutions lab. I know from
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This is from my hydrolysis of salts and pH of buffet solutions lab. I know from the colors im supposed to get the pH range, but I'm not exactly sure how to determine the pH. Help would be appreciated! the occurrence of CO2 dissolved in solutions. with walul the CO2 reacts generate H The solubility of co2 is greatest in basic solutions, intermediate in neutral solutions, and least in acidic solutions. Therefore, even distilled water will be somewhat acidic unless it is boiled to remove the dissolved co2 13 Red 12.0 12 Alizarin yellow Phenol- 10.1 Red phthalein Blue Colorless Yellow Yellow Bromothymol Methyl Yellow Yellow Yellow Methyl Color changes A FIGURE 1 The color behavior of indicators.Explanation / Answer
From the given indicator color table if we add an indicator to an unknown solution we will be able to guesstimate the pH range of that solution.
For example when methyl orange is added to any of the solutions of unboiled water, NaC2H3O2, NH4Cl, ZnCl2 and Na2CO3 produced an yellow color, According to indicator color table this indicates the pH range of those solutions is 5 to 6.
But the same indicator when added to KAl(SO4)2 it gave red color for that solution. Whenever this indicator gives out red color it can safely be said that the pH range of that solution is 2 to 3.
However if methyl orange indicator shows methyl orange color when added to any unknown solution and it can safely be said that the pH range of that solution is 3.1 to 4.4.
Similarly it can be said for other indicators as well with other solutions in the table.
However, if one wants to know exact pH of any given solution we must know the concentration of dissolved ions in aqueous solutions and without knowing concentration we can not know the exact pH of that solution.
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