The 100% NECO 2014 Chemistry Practical Answers Available Here Question One A is an acid HCL containing 3.8g/dm3 of HCL. B is a solution of NaOH, put A into the burette and titrate with 20 or 15cm3 of solution of B. Record the value of solution B used. Using methyl orange as indicator ( H=1 , cl=35.5 , O=16 , N=1 ) Equation of reaction HCL(aq) + NaOH(aq) ---------> Nacl(aq) + H2O(l) (A)Record the average volume used of A. (bi)Cal. Conc of A in mol/dm3 (ii). Conc of B in mol/dm3 (iii). Conc of B in g/dm3 (C) state the function of methyl orange used (ii) State the action of methyl orange in sol A and B Solutions. Volume of burette | Rough | Ist titre | 2nd titre Final Reading(cm) | 26.00 | 22.40 | 32.24 Initial Reading(cm)| 0.00 | 0.00 | 0.00 Volume of A.(cm) |26.00 | 22.40 | 22.40 Average volume used= ( 22.40 + 22.40 )/2 =22.40cm3 (I) Conc, of A in mol/dm3= mass/molar mass Mass of A is 3.89g/dm3 Molar mass of A(Hcl) = ( 1 + 35.5 ) =36.5 Therefore 38.9/36.5 =0.1066mol/dm3 (ii) Conc. Of B in mol/dm3= CaVa/CbVb = Na/Nb = 0.1066 x 22.40/Cb x 25.00 = 1/1 Cb = 1 x 0.1066 x 22.40/25.00 x 1 Cb = 0.0955mol/dm3 NOTE:- There is Noting Like Free Posting ooo This is all we will post Here, the full Answers are for our Subscribers and it has been posted for them and Direct mobile candidates have receive it also You Can Subscribe Below NECO (PRACTICAL CHEMISTRY) Direct Mobile: N800 MTN Card. Password/PIN: N300 MTN Card. Forward your Username, MTN CARD PIN, Subject Name, Phone number to: 08035608621.
Posted on: Wed, 04 Jun 2014 06:34:39 +0000
Trending Topics
Recently Viewed Topics
© 2015