A mixt. of 46.32 of pure NaOH ir dinsolved in water and diluted to 1000mL. what vol- of 1-022 N HCA iu required to neutralize 50.00mL of the roln.? what vol. of 1.022 N H2SO4 is required to neutralize so.00 m of the roln.? pure kOH and 27.64 g of
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What is the solution of this? The given answer is
74.19 mL ; 74.19 mL
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- The equilibrium constant for the reaction 2CrO42+2H+Cr2O72+H2O is 4.2 1014. The molar absorptivities for the two principal species in a solution of K2 Cr2 O2 are Four solutions were preparedby dissolving 4.00 10-4, 3.00 10-4, 2.00 10-4,and 1.00 10-4 moles of K2 Cr2 O7 in water and diluting to 1.00 L with a pH 5.60 buffer. Derive theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm, (b) 370 nm, and (c) 400 nm.3. A 50.0 mL of 0.02 F ammonia solution is added to a solution containing 0.004 g Ni.0.003 g Mn. and 0.002 g Cr2 per 750 ml. calculote whether or not o procioitate wil form b. fanswer to (o) is ves. formulos of precipitates C which onwil prec pitate fist d what pHis necessary to pevent prec ptaion of al catonsQl is dissolved in 250 ml, what is the tutul normadily of A Sada- Lime Sample is go% NaoH and 10% CaO • If 3gm the Selution as abase ? How many milliliters of O.57 N H2 S4 would be requiresd to titrate 100 me of the Solution ? Ans.s (0.309 N, 60.59 ml)
- 73 Al ihe school ey decided to adt sodum carbonae (NaCOJ tohe sampled wster in the school tankin order to restore he sttavalue close to The balanced equartion for the reaction is Na,Co.e) + 2HC (ag - 2Nac (ag • H0()• co; (al 731 Calcuate the mass of sodum cartonate (Na,CO.) required to neutralize each 1 dm' of the sample water 732 Ater the neutralization. the water tasted saty. Give a reason for the saly taste of the water Refer to the equation above.How many grams of sample which contains 20.00% Na2O (61.98) should be taken for analysis in order to obtain a precipitate of Na3AsO3 (191.89) which weighs 0.2500 g? a. 0.8075 g b. 0.6056 g c. 0.6729 g d. none of these6. The phosphorus content in a 0.3004-g sample was precipitated as (NH4);PO4 .12M0O3 a slightly soluble precipitate. The precipitate was filtered, washed, and further redissolved in acid. The resulting solution was treated with an excess of Pb²* resulting in the formation of 0.3017 g of PbMoO4. Calculate the % w/w of P2Os.||
- A1.223 g sample containing arsenic (As) was converted to H3AS0, by suitable treatment. 40.00 ml. of 0.07891 M AGNO3 was then added to the acid to precipitate arsenic quantitatively as AgAs01. The excess AgNO3was back-titrated with 11.27 ml. of 0.1000 M KSCN ; the Reacti on was Cal culate the percent of As,03 in the sample. 1. O5.47 2. O2.23 3. O11.15 4. O66.92 5. O33.45Read and urete on the selection of a proper Indicator • What is an Indicator Chemistry Of work ? )u Factors which result in Indicator f an acıd/base Indicator (how does it Colour Chawge of an Indicator Cuhat is ?) range ranges of different lndicators Indicator which Indicafors reaction may be used for which Indicator • General rule for Cho.ce of an . Itow to determine range at which an Indicator whe of wHl Change colour.t to tuasd ssem uL () the The moralify of the souhm The mnany of the sonunon हुर्गज् strongest Type f the IMf fornd in this soution to ·a t o tusad Ssem of mg coH)2 in 300.0g %801.da, at punot seu woynios (alculate. て of water. The oensiy of the finoal ha unthos
- ml of sodium carbonate solution 250 contains 2.65g of Na2CO3. If 10 ml of the solution is diluted to1 L. What is the concentration of the ?resultant solution molecular weight of sodium carbonate) * (=106g/mole M 0.1 O 0.001M O 0.01M O 1000M OCalculate the hinal Concentaton of k' lag), CoO¢ (aq), Ba"cq prepared by addig o.100L of to 0.150L of 0.250 M Ba Bra 2t nd br aq) in a soluteon 0.200 M KCO, ( for ba Ca Qu , K, = , Ksp 2.3x108)A solution contains anions with the following concentrations: 0.20 M CO, and 0.01 M Cr If a dilute AGNO3 solution is added to this solution, which is the first compound to precipitate? O a. None of the responses O b. Ag;CO; (Kap = 1.2 x 1012) %3D O C AGCI (K, = 1.8 x 10-19) O d. Both compounds will precipitate at the same time