State oxygen on-site wth alkaline solutions

Assignment Help Chemistry

Reference no: EM13207255

A water chemist obtained a 250-mL sample from a nearby lake and fixed the oxygen on-site wth alkaline solutions of MnS04 and Kl-NaN3-. returning to the labrotary, a 200-mL sample was analyzed by acidifying the sample with conc H2SO4 and then titrating with 14.4 mL of 0.0213 M Na2S2O3 solution to the starch endpoint.

a) calculate the number of moles of I3- that reacted with the Na2S2O3 solution.

b) calculate the number of moles of Mn(OH)3 that were produced from the reduction of the dissolved oxygen.

c) calculate the number of moles and milligrams of O2 present in the titrated sample.

d) what is the dissolved oxygen concentration in the sample, expressed in ppm O2?

Reference no: EM13207255

Questions Cloud

Compute ka for acetic acid in both the molal : Calculate Ka for acetic acid in both the molal and molar standard states. Use as many sig figs as your calculations in part b.) warrant.

How to reduce the governments outstanding debt : Assume that the treasury is currently running large surpluses (tax collections exceed new government spending). On a S/D diagram show the effect on Treasury Bond markets of using these surpluses to buy back outstanding treasury securities.

Find a 99% confidence interval for the population mean price : Find a 99% confidence interval for the population mean price (per 100 pounds) that farmers in this region get for their watermelon crop. What is the margin of error? (Use 2 decimal places.)

Which measure has the greater dispersion : Test Scores: mean=100 variance = 225 Years of Service: mean=5 variance = 81 Of test scores and years of service, which measure has the greater dispersion?

State oxygen on-site wth alkaline solutions : A water chemist obtained a 250-mL sample from a nearby lake and fixed the oxygen on-site wth alkaline solutions of MnS04 and Kl-NaN3-. returning to the labrotary, a 200-mL sample was analyzed by acidifying the sample

Find parametric equations for the tangent line to the curve : find parametric equations for the tangent line to the curve with the given parametric equations, x=2cost, y=2sint, z=4cos2t, at the specified point (sqrt(3),1,2)

How many children were at the reunion : The Cobb family decided to go roller skating for thier reunion. There were a total of 44 people there and all went skating. If an adult admission was $5.00 and a child's admission was $3.00 and they paid a total of $168.00, how many children were ..

Making a scientific discovery a useful technology : Monetary considerations aside, which would you find more personally satisfying: making a scientific discovery or inventing a useful technology? Why?

What was her average price per share : An investor bought 150 shares of High Flying Airlines. She paid $60 per share for 50 shares, $50 per share for 60 shares, $75 per share for 40 shares. What was her average price per share?

User Account

All Pages