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Showing posts with label STOICHIOMETRY:. Show all posts
Showing posts with label STOICHIOMETRY:. Show all posts
Saturday, May 27, 2023

A solution contains Na 2​ CO 3​ and NaHCO 3​ . 10 mL of the solution required 2.5 mL of 0.1 M H 2​ SO 4​ for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H 2​ SO 4​ was required. Calculate the amount of Na 2​ CO 3​ and NaHCO 3​ in one litre of the solution.

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100mL of a water sample contains 0.81g of calcium bicarbonate and 0.73 of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO 3​ is:(molar mass of calcium bicarbonate is 162g mol^−1 and magnesium bicarbonate is 146 gmol −1 )

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(A) 1000 ppm (B) 10000 ppm (C) 100 ppm (D) 5000 ppm Solution : n e q ​ . C a C O 3 ​ = n e q ​ C a ( H C O 3 ​ ) 2 ​ + n e q ​ M g ( H C O 3...
Sunday, May 9, 2021

Write the POAC equations for all the atoms in the following reaction.

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Illustrative solution: Applying POAC on (P) atoms:                                                      P à H 3 PO 4 Numbers of mol...

In a determination of P an aqueous solution of NaH2PO4 is treated with a mixture of Ammonium and magnesium ions to precipitate magnesium Ammonium phosphate (Mg(NH4)PO4.6H2O. This is heated and decomposed to magnesium pyrophosphate. Which is weighed. A solution of NaH2PO4 yield 3.33 gm of Mg2P2O7. What is weighed of NaH2PO4 was present originally.

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Related Questions: Principle of atom conservation (PAOC): Illustrative example (2)  27.6 gm K2CO3 (138) was treated by a series of reagents ...

For BaCl2.XH2O , 2.1 gm of Compound gives 2 gm of anhydrous BaSO4 (M.mass =233)upon treatment with H2SO4 then calculate value of X.

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  Related Questions: Principle of atom conservation (PAOC): Illustrative example (2)  27.6 gm K2CO3 (138) was treated by a series of reagent...

All the carbon atom present in KH3(C2O4)2.2H2O weighting 254 gm is converted to CO2. How many gram of CO2 were obtained.

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  Illustrative solution: Related Questions: Principle of atom conservation (PAOC): Illustrative example (2)  27.6 gm K2CO3 (138) was treated...

0.32 gm mole of LiAlH4 in ether solution was placed in a flask and 74 gm (1 mole ) of t- butyl alcohol was added . The product is LiAlHC12H27O3. Calculate mass of product if all lithium atoms are converted.

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Illustrative solution: By applying POAC on (C) atoms: Related Questions: Principle of atom conservation (PAOC): Illustrative example (2)  27...

27.6 gm K2CO3 (138) was treated by a series of reagents so as to convert all its carbon into K2Zn3[Fe(CN)6]2(MM=698) Calculate mass of K2Zn3[Fe(CN)6]2.

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  Here all the carbon of K2CO3 converted into a complex hence POAC can apply Related Questions: Illustrative example (2) 0.32 gm mole of LiA...
Sunday, December 6, 2020

A plant virus is found to consist to uniform cylindrical particles of 150Å in diameter and 5000Å long. The specific volume of the virus is 0.75 cm3/g. What is the molecular mass of virus ?

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  Related Questions: Calculate the amount of 80 % pure NaOH sample required to react with 21.3 gm Chlorine in hot condition. When 1.25 gm sa...
Thursday, October 1, 2020

25 ml of household bleach solution was mixed with 30 ml of 0.50 M KI and 10 ml of 4.0N acetic acid. In this titration of the liberated iodine 48 ml of 0.25 N Na2S2O3 was used to reach the end point. The Molarity of household bleach solution is?

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Related Questions: (1) What are the Antichlor ? (2) If 4 gm of bleaching powder dissolved to give 100 ml solution 25 ml of it reac...

Calculate the % of available chlorine in the sample in a sample of 3.35 gm of bleaching powder which was dissolved to 100 ml water. 25 ml of this solution on treatment react with KI and dilute acid. Required 20 ml 0.125 N Hypo solution (Sodiumthiosulphate- Na2S2O3).

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Related Questions: (1) What are the Antichlor ? (2) If 4 gm of bleaching powder dissolved to give 100 ml solution 25 ml of it re...

What are the Antichlor ?

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An antichlor  is a substance used to decompose residual hypochlorite or chlorine after use of chlorine based bleaching , in order to preve...

If 4 gm of bleaching powder dissolved to give 100 ml solution 25 ml of it react with excess of CH3COOH and KI .The Iodine liberation required 10 ml of 0.125 N Hypo solutions. Calculate % of available chlorine in the sample.

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Available chlorine in sample of bleaching powder can be calculated as per the following reactions.
Saturday, September 26, 2020

How many grams of Fe2O3 formed by heating of 18 gm FeO with O2.

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SOLUTION:

How many moles O2 are required to needed produced 5 moles of Fe2O3.

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SOLUTION:

367.5 gm KClO3 (122.5) when heated then calculate. (1) How many gram of O2 is produced? (2) How Many litre of O2 is produced at STP?

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SOLUTION:
Saturday, May 9, 2020

pH of a 0.1 M monobasic acid is found to be 2. Hence its osmotic pressure at a given temp. TK is:

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Wednesday, April 29, 2020

Air contains 20℅ O2 by Volume.How many cc of air will required for oxidation of 100 cc of acetylene?

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0.0833 moles of a carbohydrate having empirical formula of CH2O contains one gram hydrogen, find molecular formula

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Given EF= CH2O then mass=30 And carbohydrate(CH2O) contains 1gram hydrogen: From EF it is obvious that 2 grams hydrogen present in 30 grams ...
Friday, April 24, 2020

A six co-ordinate complex of formula CrCl3.6H2O has green colour. One litre of O.1M solution of the complex when treated with excess of AgNO3 gave 28.7 g of white precipitate. The formula of the complex is .... (1) [Cr(H2O)6]CI3 (2) [Cr(H2O)5CI]CI2.H2O (3) [Cr(H2O)4CI2]Cl.2H2O (4) [Cr(H2O)3Cl3].3H2O

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SOLUTION:  Given 28.7 g of white ppt obtained is 28.7/147.5= 0.2 mole Agcl precipitate Since 0.1M complexgives 0.2 mole AgCl means 2Cl− are ...