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+ (aq) -> Br - (aq) + Sb 5+ (aq) (unbalanced)

Calculate the amount of antimony in the sample and its percentage in the ore.

_ g

_ %

Help please? Thank you.

Expert Solution

Solution-

The balanced equation can be obtained as below

BrO3- ==> Br- . . .Add 3 H2O to the right side to balance O.
BrO3- ==> Br- + 3H2O . . .add 6H+ (acidic solution) to the left side to balance H.
BrO3- + 6H+ ==> Br- + 3H2O . . .add 6e- to the left side to balance the charge.
BrO3- + 6H+ + 6e- ==> Br- + 3H2O

Sb3+ ==> Sb5+ . . .Add 2e- to the right side to balance the charge.
Sb3+ ==> Sb5+ + 2e-

Now we multiply the Sb equation by 3 to give 6e- on the right side. Then add the new equation to the BrO3- equation; the 6e- will cancel.

.3Sb3+ ==> 3Sb5+ + 6e-
+BrO3- + 6H+ + 6e- ==> Br- + 3H2O
===================================
3Sb3+ + BrO3- + 6H+ ==> 3Sb5+ + Br- + 3H2O

moles BrO3- added = M BrO3- x L BrO3- = (0.130)(0.0378) = 0.004914 moles BrO3-

From the balanced equation, we get that 1 mole of BrO3- reacts with 3 moles of Sb3+.

0.004914 moles BrO3- x (3 mole Sb3+ / 1 mole BrO3-) = 0.0147 moles Sb3+

the molar mass of Sb= 121.8 g.

0.0147 moles Sb x (121.8 g Sb / 1 mole Sb) = 1.79 g Sb

%Sb = (g Sb / g ore) x 100 = (1.79 / 8.65) *100 = 20.69 %Sb

queen_honey_blossom answered 2 years ago

The percentage of arsenic in a sample can be determined by titration with iodine. In the...

The percentage of arsenic in a sample can be determined by titration with iodine. In the determination, all of the arsenic (As) in the sample is converted to HAsO2 followed by titration with iodine (I2) solution. The chemical equation for the reaction between HAsO2 and I2 is: HAsO2 (aq) + I2 (aq) + 2 H2O (l) → H3AsO4 (aq) + 2 H+ (aq) + 2 I − (aq) In an actual analysis, a 0.7034 g sample is dissolved and the...

Define oxidation, reduction, and oxidation number. Describe how oxidation and reduction affect the oxidation number of an element.

Oxidation-Reduction Activity Series Hands-On Labs, Inc.Version 42-0186-00-02 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Exercise 1: Describing...

. Write electronic configurations of beryllium with oxidation number +2, copper, and antimony with oxidation number...

. Write electronic configurations of beryllium with oxidation number +2, copper, and antimony with oxidation number +3. For each element, write electronic block where they belong (s, p, d, f) and valence electrons and quantum number for one electron of each element.

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.

Oxidation-Reduction Titration Sulfuric acid used was 6 M All Lab notes are at the bottom, procedure...

Oxidation-Reduction Titration ***Sulfuric acid used was 6 M ***All Lab notes are at the bottom, procedure included for clarity... PLEASE HELP WITH THE SHORT ANSWER:) PROCEDURES: Experiment 1: Prepare the Materials Take four 100.00 mL volumetric flasks from the Containers shelf and place them on the workbench. In one flask, prepare a standard solution of potassium dichromate (K2Cr2O7): Take potassium dichromate from the Materials shelf and add 4.00 g to the volumetric flask. Take water from the Materials shelf and...

Redox (oxidation-reduction) reactions in glycolysis

Part A - Redox (oxidation-reduction) reactions in glycolysis In glycolysis, as in all the stages of cellular respiration, the transfer of electrons from electron donors to electron acceptors plays a critical role in the overall conversion of the energy in foods to energy in ATP. These reactions involving electron transfers are known as oxidation-reduction, or redox, reactions. Drag the words on the left to the appropriate blanks on the right to complete the sentences. 1. When a compound donates (loses)...

The concentration of HCl can be determined by titration with a primary standard such as sodium...

The concentration of HCl can be determined by titration with a primary standard such as sodium carbonate ( Na2CO3 ). The titration reaction is CO2−3+2H+⟶H2O+CO2 What is the concentration of HCl if 38.3 mL of HCl was needed to to react with 0.501 g of Na2CO3 to reach the end point?

The concentration of HCl can be determined by titration with a primary standard such as Na2CO3...

The concentration of HCl can be determined by titration with a primary standard such as Na2CO3 (sodium carbonate). The titration reaction isCO3^(2-) + 2H+ yields H2O + CO2What is the concentration of HCl if 25.9 mL of HCl was needed to to react with 0.311 g of Na2CO3 to reach the end point?

The amount of l3 (aq) in a solution can be determined by titration with a solution...

The amount of $\mathrm{I}_{3}{ }^{-}(a q)$ in a solution can be determined by titration with a solution containing a known concentration of $\mathrm{S}_{2} \mathrm{O}_{3}{ }^{2-}(a q)$ (thiosulfate ion). The determination is based on the net ionic equation$$ \mathbf{2 S}_{2} \mathbf{O}_{3}^{2-}(a q)+\mathbf{I}_{3}^{-}(a q) \rightarrow \mathbf{s}_{4} \mathbf{O}_{6}^{2-}(a q)+3 \mathbf{I}^{-}(a q) $$Given that it requires $34.3 \mathrm{~mL}$ of $0.360 \mathrm{M} \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}(a q)$ to titrate a $30.0-\mathrm{mL}$ sample of $\mathrm{I}_{3}^{-}(\mathrm{aq})$, calculate the molarity of $\mathrm{I}_{3}^{-}(\mathrm{aq})$ in the solution.

Using half equations for the oxidation and reduction, develop the redox equation for the oxidation of...

Using half equations for the oxidation and reduction, develop the redox equation for the oxidation of cyclohexanone under acid conditions.

Question