If this lab's procedure were carried out using 20.51 ml each of 0.249 M K2CrO4 and 0.159 M Pb(NO3)2. How many mmol of K2CrO4 were used in this reaction? Report your answer with 3 significant figures.
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Q: A 50.0 mL solution of Ca(OH)2 with an unknown concentration was titrated with 0.340 M HNO3. To reach…
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A: Mass of sample = 5 g Volume of HCl = 25 mL Molarity of HCl= 1.350 M
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- Consider the reaction of 75.0 mL of 0.350 M C₅H₅N (Kb = 1.7 x 10⁻⁹) with 100.0 mL of 0.411 M HCl. How many moles of C₅H₅N would be present before the reaction takes place?Average mass of the precipitate MgNH4PO4·6H2O (s) / g Average phosphate concentration in water sample (mass/volume %) % difference of 2 trialsA 2.0 g of MgCO3 was dissolved and diluted to exactly 500-mL volumetric flask. If 50-mL aliquot was used in the analysis, what is the weight of MgCO3 present in the aliquot sample
- You have to make 50 mL of 0.05M HCl from a 10M HCl stock solution, but the only measuring devices available are 100mL graduated cylinders and 10mL serological pipets. How could you accurately make the dilute HCl solution (clearly explain)?The first goal is to make the oxalic acid standard solution. You measure 1.5232 g of oxalic acid on an analytical balance, add it to a 250-mL volumetric flask and add deionized H2O to a final volume of 250.0 mL. Molar mass of H2C2O4•2H2O = 126.07 g/mol Mass of H2C2O4•2H2O = 1.5232g what is the Number of moles of H2C2O4•2H2O?A student prepared benzoic acid using the method described in the procedure using 4.05 g KMnO4, 2.00 mL benzyl alcohol and 150 mL 3.0M H2SO4. How many molar equivalences of hydrogen ions were added to the reaction?
- How to prepare these solutions? 250.0 mL 0.125 M stock Na2S2O3 solution from Na2S2O3·5H2O crystals 250 mL 0.10 M NaOHNOTE: Use the 1.0 M NaOH prepared250.0 mL standard 2500 ppm Cu(II) stock solutiona. Weigh and dissolve appropriate amount of Cu(NO3)2·5H2O crystals in enough distilled water.A student, performing the same experiment as you, recorded the following information. The original solution was diluted by a factor of 5.Calculate the volume of NaOH used to reach the equivalence point. Volume of diluted vinegar sample (mL) 25.00 Molarity of NaOH 0.0900 Initial buret reading (mL) 16.50 Final buret reading (mL) 38.00 Volume of NaOHIf 56.0 mL of a 0.85 M Ca(NO3)2 was mixed with 87.5 mL of 0.70 M NaCl, what is the final concentration of NO3-? Please show your work!
- If I have a concentrated stock chemical at 4.4 Molar, and I need 350mL at 1.5 Molar, how do I make this?Why a precipitate of manganese dioxide be removed from the potassium permaganate solution before standardization?3. Describe the characteristics that a crystal obtained through recrystallization must have, the final crystal, not the solvent.