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[quote uid=merrylarry pid=1098] 1) Equation: H2 C 2O 4 2NaOH -- -- - -- -- - > Na2 C 2O 4 2H 20 Amount of NaOH used = Molar Conc ( mol/dm 3) x Vol = 0 .250 x 22.2 /1000 = 0 .00555 mol or 5.55 x 10^- 3mol From the Equation: = 2 mole of Naoh Requires 1 mol of Na0h require 1/2 of H 2C 2 O 4 . 5 .55 x 10^- 3Mol of NaOh require 1/2 ( 5.55 x 10^- 3) = 2. 78 x 10^- 3Mol Molar Conc of Acid = Amount Of acid in Mol / Vol of acid = 2 .78/25 = 0 .111 mol/dm 3 To find the Volume of x Mass conc . Of hydrated acid of 3 .5 in 250cm 3 Ie 250 cm3 conc . 3.5 of Hydrated acid = 3 .5 x 1000 / 250 = 14 .0g /cm3 -- - -- -- - -- -- - -- -- - -- -- - -- ( 1. Cont ') Cn - -- - > fecl 3 Dn - -- - > Na 3So 4 ARRANGE THIS IN A TABULAR FORM ( i ) TEST : Cn + Water OBSERVATION : Yellowish solution INFERENCE: Fe ^3+ Present ( ii ) TEST : Solution( i ) + NaOH solution in drops and in excess OBSERVATION : Reddish brown ppt formed insoluble in excess NaOH solution INFERENCE: Fe ^3+ Presents ( iii ) TEST : Solution( i ) + NH3 solution in drops fill in excess OBSERVATION : Reddish - brown ppt insoluble INFERENCE: Fe ^3+ Present ( iv ) TEST : To the solution ( i ) + C 3Fe ( CN) 6 Solution OBSERVATIONS: Blood Red Colouration INFERENCE: Fe ^3+ Confirmed ( v ) TEST : solution Cn + AgNO 3( ag ) + Dilute HNO3 ( ag) + Ammonia solution ( NH 3) ( ag ) OBSERVATION : White Precipitate , ppt insoluble , ppt dissolved to colourless solution INFERENCE: Co3^2- So 3^2 C 1^- , C 1^- Present , C 1^- Confirmed . ( vi ) TEST : Dn + Water + Dil HcL warm OBSERVATION : Gas Elvolved , Colourless , Irritating Smell, Turn Blue Litmus Red INFERENCE: So 2 Gas From So 3^2- , ion present ( v ) TEST : Solution + Baclr ( ag) + Dilute HcL OBSERVATION : White ppt , ppt insoluble INFERENCE: Co3^2 SO 4^2- SO 3^2- present , SO3 ^2 Confirmed. ( 1) . Methyl Orange - pink in acid , - Orange in methyl , yellow in Alkali. ( 2) . Phenolpthalein - colourless in acid - colourless in neutral, pink in alkali ( 3) . Weak acid VS Strong base - Phenolpthalein e .g NaoH + COOHCOOH -- - -- -- - -- -- - -- -- - -- - 2a) Test: Put c into a test and add about 5cm of distilled water & shake thoroughly Observation: Insoluble in Water Inference: Insoluble Salt --------------------------------------------------- 2bi) Test: Divide the filtrate into 2 portion, to the first portion and dilute sodium hydroxide sol in Drops & excess Observation: Reddish Brown ppt formed insoluble in excess Naoh sol Inference: Fe3 is present in soluble and Fe3 is present in excess --------------------------- 3aii) -the boilling melt of the water must be at 100degree -the water must give spit on a paper chromotography -the freezing point must be 0degree 3iii) adding of sodium chloride pilets to the solution 3iv)sieving for separating mixture of different solid particles [/quote]