Manganese is derived from pyrolusite ore, an impure manganese dioxide. In the procedure used to analyze a pyrolusite ore for its MnO2 content, a 0.533 g sample is treated with 1.651 g oxalic acid (H;C;O4•2 H¿O) in an acidic medium. Following this reaction, the excess oxalic acid is titrated with 0.1000 M KMNO, 30.06 mL being required. What is the mass percent MnO2 in the ore? H;C¿O4 + MnO2 + H* Mn2+ + H;0 + CO: (not balanced) H;C,O, + MnO, +H* Mn + H;O + CO; (not balanced)

A student determined the concentration of NaOCI in a commercial bleach sample using the same technique described in section "F" of the Halogens and Their Compounds lab. The student required 18 drops of 0.01M Na,S203 to reach the end point. What is the concentration (reported in molarity) of NaOCI in the bleach sample?

0.3456 g of a solid acid is dissolved in 50 mL of water in a flask  and a few drops of phenolphthalein are added to the solution.  A buret containing 0.2545 M NaOH is prepared with an initial volume of 10.50 mL.  The acid is accidentally titrated with the base beyond the end point, so 1.52 mL of 0.187 M HCl are added to the flask. The titration with the base is continued to a final volume reading of  40.55 mL.  Calculate the molar mass of the solid acid.

The following solutions are needed to be prepared for the titration procedure:1. 20 mL of 2 M HCl2. 20 mL of 0.05 M KOHYou went through the titration process wherein 1.0867 grams of Fe(OH)n was mixed with the 20 mL of 2 M HCl that you initially prepared. This solution was diluted to 200 mL and was labeled as solution A. 20.0 mL aliquot of solution A was taken and titrated with 20.0 mL of 0.05 M KOH.Submit a detailed procedure of what you had done the above titration (include all the laboratory apparatus that you used).

Ca(ClO3)2 (aq) + NH4F (aq) -> CaF2 (s) + ? A.) Determine the product. B.) Balance the equation C.) Write the net ionic reaction D.) Identify the spectator ions

Tungsten trioxide (WO,) has a rich yellow color and is often used as a pigment in ceramics and paints. To test a ceramic vase for its WO, content, a 10.15 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO, to W³+. The resulting W3+ was transferred to 500.0 mL of 1.00 M HCI. A 100.00 mL aliquot of the HCl solution required 14.78 mL of 0.08271 M potassium permanganate (KMNO,) to reach the purple endpoint. A blank required 0.26 mL. Balance the redox reaction. redox reaction: MnO, + W3+ Mn2+ + WO3+ Determine the percent WO, in the ceramic sample. percent WO3: %

3. A 4.912-g sample of a petroleum product was burned in a tube furnace, and the SO2 produced was collected in 3% H₂O₂. Reaction: SO2(g) + H₂O2 → H₂SO4. A 25.00-mL portion of 0.00873 M NaOH was introduced into the solution of H₂SO4, following which the excess base was back-titrated with 15.17 mL of 0.01102 M HCI. Calculate the sulfur concentration in the sample in parts per million.

The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 6.19 g6.19 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3+⁢(aq). The Sb3+⁢(aq) is completely oxidized by 30.5 mL of a 0.115 M aqueous solution of KBrO3⁢(aq). The unbalanced equation for the reaction is   BrO^−  3(aq) + Sb^3+(aq)⟶Br^−(aq)+Sb^5+(aq)(unbalanced) Calculate the amount of antimony in the sample and its percentage in the ore. mass of antimony in grams:     percentage of antimony:

A 185.0 mL sample of 1.200 M Pb(NO₃)₂ is mixed with 52.50 mL of 1.500 M NaCl, and the PbCl₂ precipitate is filtered from the solution. Then 200.0 mL of 3.000 M NaBr is added to the remaining solution, and the PbBr₂ precipitate is also collected and dried. What is the mass (in grams) of the PbBr₂ precipitate, assuming the yield in each precipitation step is 100%?

When 50.0mL of a 0.335M potassium carbonate solution is mixed with 0.045L of a 0.390M nickel(II) chloride solution the following reaction occurs: K2CO3 (aq) + NiCl2 (aq) → a. Complete the reaction equation b. Calculate the mass of precipitate formed c. Calculate the concentration of each ion in the mixture when the reaction is complete