A)A beaker containing 50 cm3 of 0.2 mole/dm3 sodium thiosulfate was placed on the top of a black cross. Then 5 cm3 of 2 moles/dm3 hydrochloric acid was added. And the clock started which(Na2S2O3 or HCl) is limiting reagent? The chemical equation for the reaction is given below. (3)
Na2S2O3 + 2 HCl --> 2NaCl + SO2 + S + H2O
b) Write about solid, liquid and gas using property movement of particles

1) in saturated limewater, [h+ ]=3.98x10-13 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 2) in butter, [h+ ]=6.0x10-7 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 3) in peaches, [oh]=3.16x10-11 m a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 4) during the course of the day, human saliva varies between being acidic and basic. if [oh]=3.16x10-8 m, a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? /

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3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?