Write complete balanced equations for the following reactions in aqueous solution. Identify any precipitates that would form and list their color. If no reaction would occur, write NR. You may refer to the table of solubility rules provided with this experiment to determine which product is the precipitate. AGNO3 + KCr-O4 ---> ?
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- You are presented with a white solid and told that due tocareless labeling it is not clear if the substance is bariumchloride, lead chloride, or zinc chloride. When you transferthe solid to a beaker and add water, the solid dissolves to givea clear solution. Next a Na2SO4(aq) solution is added anda white precipitate forms. What is the identity of the unknownwhite solid?The arsenic in a 1.22-g sample of a pesticide was converted to As by suitable chemical treatment. It was then titrated using Ag+ to form Ag3AsO4 as a precipitate. (a) What is the oxidation state of As in As ? (b) Name Ag3AsO4 by analogy to the corresponding compound containing phosphorus in place of arsenic. (c) If it took 25.0 mL of 0.102 M Ag+ to reach the equivalence point in this titration, what is the mass percentage of arsenic in the pesticide?What is precipitation-titration? Then, briefly and consisely describe the methodology employed in the study (i.e define the titrant, the primary standards used, precipitants, etc that were essential in the process).
- A series of sulfate samples is to be analyzed by precipitationas BaSO4. If it is known that the sulfate contentin these samples ranges between 20% and 55%, whatminimum sample mass should be taken to ensure thata precipitate mass no smaller than 0.200 g is produced?What is the maximum precipitate mass to be expectedif this quantity of sample is taken?Write a series of equations to illustrate each of the following reactions.When 38.0 mL of 0.1250 M H2SO4is added to 100. mL of a solution of PbI2, a precipitate of PbSO4forms. The PbSO4is then filtered from the solution, dried, and weighed. If the recovered PbSO4is found to have a mass of 0.0471 g, what was the concentration of iodide ions in the original solution?
- After studying the separation scheme for Group III cations and using your background knowledge on separation of Group I and Group II cations: (a) devise a flow chart or schematic diagram to separate and confirm the presence of the given ions in the solution below; (b) write the chemical formula of the precipitates formed; and (c) provide a brief explanation about your schematic diagram.The concentration of CO in air is determined by passing a known volume of air through a tube that contains I2O5, forming CO2and I2. The I2 is removed from the tube by distilling it into a solution that contains an excess of KI, producing I3-. The I3-is titrated with a standard solution of Na2S2O3. In a typical analysis a 4.79-L sample of air is sampled as described here, requiring 7.17 mL of 0.00329 M Na2S2O3 to reach the end point. If the air has a density of 1.23 × 10–3 g/mL, determine the parts per million CO in the airA dietary iron supplement consist of tablets containing the metal in the form of ferrous ions (Fe2+). Themetal content of these tablets can be determined by dissolving a weighed amount of tablet(s) in dilutesulphuric acid solution and titrating an aliquot of this solution with a standard potassium permanganatesolution as follows: One of the tablets is finely ground and the resulting powder has a mass of 0.4500 g. Distilled water and some sulphuric acid is added until the sample is dissolved. This solution istransferred to a 250.00 mL volumetric flask and made up to the mark. A 25.00 mL portion of this solution is pipetted into a conical flask, and titrated with a 0.0200 M KMnO4solution. The endpoint of the titration is determined when the colourless solution in the conical flask turns abright pink due to the presence of excess permanganate ions. The average titration value is 6.23 mL of the KMnO4 solution. 2KMNO4+8H2SO4+10FeSO4= K2SO4 +2MnSO4 +8H20 +5Fe2(SO4)3 1.Determine the…
- The following reactions (note that the arrows are pointingonly one direction) can be used to prepare an activity seriesfor the halogens:Br2(aq) + 2 NaI(aq)----->2 NaBr(aq) + I2(aq)Cl2(aq) + 2 NaBr(aq)----->2 NaCl(aq) + Br2(aq)(a) Which elemental halogen would you predict is the moststable, upon mixing with other halides? (b) Predict whethera reaction will occur when elemental chlorine and potassiumiodide are mixed. (c) Predict whether a reaction will occurwhen elemental bromine and lithium chloride are mixed.Titration of a 10.00 mL sample of vinegar requires 19.45 mL of 0.2891 Msodium hydroxide to reach an end-point. Assuming a density of 1.01 g/mL forthe vinegar, what is the mass percent of acetic acid (HC2H3O2) in thevinegar?What volume of 0.50 M H,SO, must be added to 65mL of 0.20 M H2SO, to give a final solution of 0.35 M? Assume volumes are additive.