one of the following is not correct about Volhard method a. you can filtrate the precipitate before carrying out titration to the liquor b. silver chloride precipitate can be isolated by methanol c. relies on back titration d. Ksp of silver thiocyanate is less than Ksp of silver chloride
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- A suitable target for the titration is 30.0 cm3 of 0.025 moldm-3 Br2(aq) Justify why a much smaller target titre would not be appropriate Calculate the amount in moles of bromine in the target titer Justification? calculate a suitable massof alive oil to transfer to the volumetric flask using your answer to of above question and the structure of Y Assume that the olive oil contains 85/- of Y by mass (If you were unable to calculate the amount of bromine in the target titer,you should assume it is 6.25×10^-8 mol .this in not the correct amount)After preparing 500 mL of 0.1019 M NaOH solution, the cap is left open and it absorbs 0.652 g CO2. With this solution, Calculate the relative carbonate error in acetic acid titration besides the phenol phthalate indicator.Five drops of dichlorofluorescein have been added to a solution containing 0.800 g sample which required 25.30 mL of 0.100 M AgNO3. (a) Identify the type of argentometric titration method used.
- A solution is 0.025 M in Pb2 + . What minimum concentration of Cl- is required to begin to precipitate PbCl2? For PbCl2, Ksp = 1.17 * 10 - 5.a) 1.17 * 10 - 5 Mb) 0.0108 Mc) 0.0216 Md) 5.41 * 10 - 4 MA 0.574-g sample of a chlorocarbon compound was analyzed by burning it in oxygen and collecting the evolved gases in a solution of NaOH. After neutralizing, the sample was treated with 26.21 mL of a 0.28 M AgNO3 solution. This precipitated the chloride (Cl-) out as AgCl and left an excess of AgNO3. The excess AgNO3 was titrated with 0.122 M KSCN and required 24.91 mL to reach the endpoint in a Volhard titration. Calculate the % w/w Cl– (35.45 g/mol) in the sample. Provide your answer to 2 places after the decimal point and without units. Reactions: Cl– + Ag+ → AgCl(s) Reaction 1 Ag+ + SCN– → AgSCN(s) Reaction 2Chemistry A 20 mL solution containing both Ca2+ and Mg2+ cations is diluted in to 100 mL. When 10 mL of this solution is taken and titrated with 0.05 M EDTA at pH = 10 in the presence of Erio – T indicator, the consumption is found as 12 mL. A new 10 mL was taken from the same solution and (NH4)2C2O4 is added on it and then formed the precipitate is filtered. The filtered solution is titrated with the same EDTA solution and the consumption is found as 3 mL. So find the Ca2+ and Mg2+ amounts in the main sample solution in terms of mg/L.
- A sample is known to contain about 20% soda ash. What sample size should be taken for analysis, if it is to be dissolved into a 50 mL volumetric flask, with 10 mL aliquots analyzed, if it is desired that the analysis consume a total of 40 mL 0.10 M HCl with 10 mL of 0.10 M NaOH used in the back-titration, after boiling.10mL of a 10% by weight MgCl2 solution (density = 1.1 g / mL) is precipitated as magnesium ammonium phosphate after necessary processes, filtered and washed. The precipitate is dissolved in 50mL 1M HCl and excess acid is titrated with 2.0M NaOH solution in the presence of methyl orange. Find the NaOH consumption (Mg = 24,3g / mol, Cl = 35,5g / mol)(a) For the precipitation reaction: A+ + B– AB(s)Calculate the value of the equilibrium constant for 99.99% conversion to AB atthe equivalence point, assuming that the analyte content is 5.00 mmole and thetotal volume at the equivalence point is 100.00 mL.(b) What factors affect end-point sharpness in a precipitation titration? Explain.(c) Explain briefly why silver nitrate is an important reagent used in precipitationtitrations.(d) Mohr Method, Volhard Method and Fajans Method are commonly used for thevolumetric analysis of chlorides. Distinguish the three methods in terms of thetitrants and indicators used, and how the titrations are carried out.
- It is desired to determine the concentration of chlorides in a powdered milk following the method of Volhard, for such case 1.5g of milk is weighed, it is heated in a muffle until obtaining ashes, which are treated with acid water with some drops of HNO3, the solution is filtered and the obtained filtrate is collected in an Erlenmeyer and 20 mL of AgNO3 0 is added. 1M excess silver is titrated with 0.05M potassium thiocyanate, if 8 mL of KSCN has been used up at the time of the indicator turn. Calculate the % of chloride in the milk powder.If 50.0 mL of a 0.0010 M CaCl2 solution were added to 50.0 mL of 0.010 M Na2SO4 solution, would a precipitate of CaSO4 form? The Ksp of CaSO4 at 25oC is 2.4 × 10-5Which of the following statement regarding EDTA titration is incorrect In back titration, excess EDTA is titrated with another standard solution of a second metal ion In normal direct titration, the color of the endpoint is from the metal-indicator complex In indirect titration, the analyte can not be titrated against EDTA In masking titration, the sample or the interference can be isolated by "masking"