Determine the volume (in mL) of water that needs to be added to 25.0 mL of a 0.250 M NaBr to produce a 0.0395 M solution. Assume the volumes are additive.
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- Nickel(II) formate [Ni(HCO2)2] is widely used as a catalyst precursor and to make metallic nickel. It can be prepared in the general chemistry laboratory by treating nickel(II) acetate with formic acid (HCO2H). Ni(CH3CO2)2(aq) + 2 HCO2H(aq) Ni(HCO2)2(aq) + 2 CH3CO2H(aq) Green crystalline Ni(HCO2)2 is precipitated after adding ethanol to the solution. (a) What is the theoretical yield of nickel(II) formate from 0.500 g of nickel(II) acetate and excess formic acid? (b) Is nickel(II) formate paramagnetic or diamagnetic? If it is paramagnetic, how many unpaired electrons would you expect? (c) If nickel(II) formate is heated to 300 C in the absence of air for 30 minutes, the salt decomposes to form pure nickel powder. What mass of nickel powder should be produced by heating 253 mg of nickel(II) formate? Are nickel atoms paramagnetic?Calculate the percentage CH3COOH in a sample of vinegar from the following data.Sample = 15.00 g, NaOH used = 43.00 ml ; 0.600 N H2SO4 used for back titration =0.250 ml ; 1.00ml NaOH is equivalent to 0.0315 g H2C2O4. 2H2O.3.A sample is known to contain NaOH, Na2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCl ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample? ww ww
- o/index.html?deploymentld%=55750828934189288909969212&eiSBN=9781305657571&snapshotld%32199898&id%3... ☆ IDTAP Q Search this cou Use the References to access important values if needed for this question. The concentration of H3ASO3 in a solution is determined by titration with a 0.1945 M Ce+ solution. The balanced net ionic equation for the reaction is: 2Ce*(aq) + H3ASO3(aq) + 5H2O(1) 2Ce*(aq) + H3ASO4(aq) + 2H3O*(aq) (a) If 19.83 mL of the 0.1945 M Ce** solution are needed to react completely with 30.00 mL of the H3ASO3 solution, what is the concentration of the H3ASO3 solution? M (b) Which of the two solutions was in the buret during the titration? (c) Suppose at the end of the titration, the solution containing the Ce³* ion is transferred to a volumetric flask and diluted to 300. mL. What is the concentration of Ce3+In the diluted solution? Submit Answer 5 question attempts remaining10. A 0.514 gram sample of NazCO, (106.0 g/mol) was dissolved in distilled water in a 100.0 mi volumetric flask. The molar concentration of Na,CO, in solution is: 0.0485 M 0.0370 M b. 0.4849 M 0.0340 M 0.0330 M d. е.Answ G A 20 Answ My C X C Write C The C Whe /takeCovalentActivity.do?locator=Dassignment-take (Review Topics] (References) Use the References to access important values if needed for this question. When 22.0 mL of a 3.58×10 4 M ammonium chloride solution is combined with 25.0 mL of a 9.20x10 4 M silver nitrate solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to Submit Answer Retry Entire Group 1 more group attempt remaining Previous Next ENG 令 D US Home End Insert F10 F1 F12 F8 F9
- A mixture containing only KCl and NaBr is analyzed by the Mohr method. A 0.3172-g sample is dissolved in 50 mL of water and titrated to the Ag,CrO4 end point, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same end point. Report the %w/w KCl and NaBr in the sample.marks Profiles Tab Window Help My Ho a on x C|Cheg signment/takeCovalent Activity.do?locator=assignment-take z 5.pdf V Submit Answer S Paraph Solubility of Ionic Compounds Classify each of the compounds as soluble or not soluble: soluble silver acetate soluble sodium nitrate not soluble chromium(II) sulfate OCT 12 W Math 122 Quiz 5.docx atv A very 9 Retry Entire Group 9 more group attempts remaining Hey D • Micros all Use the References to access important values if needed for this quest PA F22-Chem-103x....pdf MogRook Air A One S Untitle - 73 S Fel-F22-Chem-1....pdf 0 14 Gramn P Aa COWLV2 | Online teaching x My Drive - Google Drive x E Lab Assessment - Google X n/takeAssignment/takeCovalentActivity.do?locator=assignment-take [Review Topics] [References) Use the References to access important values if needed for this question. Solid calcium nitrate is slowly added to 150 mL of a 0.0575 M ammonium sulfite solution. The concentration of calcium ion required to just initiate precipitation is M. Submit Answer Retry Entire Group 9 more group attempts remaining Previous Chp
- 3. A water treatment plant is estimating the amount of HCl present in the various water samples collecting from different industrial areas by volumetric analysis. One of the sample analyses required 0.2016 g of Na,CO, for 14.5 ml sample contain HCI with indicator correction of 0.5 ml with Bromo thymol blue. Calculate the amount of HCl present in the sample in gram per liter. (M.M of Na;CO,-106 g/mol)Chemistry If 110.0 mL of 0.0030 MNa2SO4(aq) is saturated with CaSO4, how many grams of CaSO4 would be present in the solution? [Hint: Does the usual simplifying assumption hold?] Express your answer using two significant figures. This answer not 0.07 0.084, 0.093.A sample is known to contain NaOH, NA2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCI ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample?