The common ore of antimony, stibnite, SbS3, can be analyzed utilizing an iodometric titration technique. The...

The common ore of antimony, stibnite, SbS3, can be analyzed utilizing an iodometric titration technique. The sample is dissolved using HCl, and titrated using I3- to a starch endpoint. The half reactions are: H3SbO3 + H2O= H3SbO4 + 2H+ + 2e-, and I3- +2e- = 3I-. Determine the %Sb in an ore sample if 0.3472 g of stibnite ore required 38.46 mL of 0.05032 M I2 to reach a starch endpoint.

Expert Solution

queen_honey_blossom answered 2 years ago

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an...

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 8.65-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 37.8 mL of a 0.130 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is BrO3 - (aq) + Sb 3+...

Cyanide recovered from the refining of gold ore can be determined indirectly by EDTA titration. A...

Cyanide recovered from the refining of gold ore can be determined indirectly by EDTA titration. A known excess of Ni2 is added to the cyanide to form tetracyanonickelate( II): 4CN + Ni ---> Ni(CN)4 When the excess Ni2 is titrated with standard EDTA, Ni(CN)4 does not react. In a cyanide analysis, 12.7 mL of cyanide solution were treated with 25.0 mL of standard solution containing excess Ni to form tetracyanonickelate. The excess Ni required 10.1 mL of 0.013 0 M...

Determination of Ascorbic Acid in Vitamin C Tablets by iodometric titration: Given: Preparation of starch indicator:...

Determination of Ascorbic Acid in Vitamin C Tablets by iodometric titration: Given: Preparation of starch indicator: Mix 1.029 gram soluble starch then dilute to 500mL with boiling hot Deionized water. Calculate the molarity. Preparation of .5M H2SO4: Mix 2.7mL H2SO4 with 100mL Deionized water. Calculate the molarity. Preparation of .3M H2SO4: Mix 3.33mL H2SO4 with 200mL Deionized water. Calculate the molarity. Preparation of .01M potassium iodate: Take 1.1273 grams of primary standard KIO3, and dilute to 500mL with Deionized water....

Hi, i'm working on lab report on iodometric determination of Cu in Brass and can someone...

Hi, i'm working on lab report on iodometric determination of Cu in Brass and can someone please explain in WORDS on how the analyte (copper) reaction with iodide works? thanks 2Cu2+ + excess I- → 2CuI(s) + I2

A sample is analyzed to determine its iron content Fe2+ via a redox titration with potassium...

A sample is analyzed to determine its iron content Fe2+ via a redox titration with potassium chromate as the titrant. In the titration Fe2+ is oxidized to Fe3+ and CrO4 2- is reduced to Cr 3+. What is the percent by mass of iron in the sample if 0.9087g of the sample required 45.68mL of a 0.04322 M K2CrO4 solution to reach the endpoint? I worked out the balanced equation to be: 8H+ + 3Fe2+ + CrO4 2- = 3Fe3+...

Explain a fraud technique in relation to the revenue cycle. How can this fraud technique be...

Explain a fraud technique in relation to the revenue cycle. How can this fraud technique be identified?

Explain how liquids can be analyzed by gas chromatography.

Post-lab: Neutralization Power of an Antacid 1) This experiment used the technique of back titration. Describe...

Post-lab: Neutralization Power of an Antacid 1) This experiment used the technique of back titration. Describe the process of back titration in 2-3 sentences. Why is back titration used instead of directly titrating a solution of antacid with 0.15 M HCl? 2) Phenolphthalein is an indicator which turns a pink color at a pH of 8.3. In this experiment, phenolphthalein is added to the antacid solution to indicate the equivalence point of the back titration. Phenolphthalein solution by itself is...

QUESTION 37 Match the appropriate term to the definition or technique. Each technique can be used...

QUESTION 37 Match the appropriate term to the definition or technique. Each technique can be used only once. As such, choice the best definition - A. B. C. D. Hypothesis Test - A. B. C. D. ANOVA - A. B. C. D. Two Way ANOVA ...

Explain how the nonprobability technique of quota sampling can be used to mimic the probability technique...

Explain how the nonprobability technique of quota sampling can be used to mimic the probability technique of stratified random sampling. Give an example.

Question