Determination of the concentration of phosphoric acid

Assignment Help Chemistry

Reference no: EM13890780

Tammy applies the skills learned from the titration of vinegar exercise to the determination of the concentration of phosphoric acid necessary for her biology project. A total volume of 8.22 mL of 0.125 M potassium hydroxide solution was required to completely neutralize 14.32 mL of phosphoric acid (three acidic hydrogens). Calculate the concentration of her phosphoric acid solution.

0.0718 M
0.144 M
0.215 M
0.0239 M
0.645 M

One grOup of students forgot to account for the vapor pressure of water when analyzing their data. How would this error affect their mass percent concentration?

The mass percent is too high because the pressure they used is too low
The mass percent is too low because the pressure they used is too low
The mass percent is too high because the pressure they used is too high
The mass percent is too low because the pressure they used is too high
Vapor pressure does not affect the calculation

Students who have lab in room 205 had to use ~ 4 mL of 3% H2O2 in order to get a volume of 45 mL of gas, while students in room 212 had to use ~6 mL. Why did the students in 212 need to use more hydrogen peroxide?
1. The temperature in 212 is much colder than 205.
2. Hydrogen peroxide decomposes slowly over time. The bottle in 205 must be older.
3. The pressure in 205 is lower than 212 because of the air conditioning unit.
4. The stockroom wasn't precise when diluting the 30% H2O2 to 3% solution.
5. Hydrogen peroxide decomposes slowly over time. The bottle in 205 must be newer.

Reference no: EM13890780

Questions Cloud

How can charles minimize present value of the tax liability : In October 2016, after Charles had paid $60,000 on the principal of the note, he received an offer to sell the land for $500,000 cash. How can Charles minimize the present value of the tax liability for Maud and him?

Competitors earn an average profit marginb : 1.Deklin Company reported net income of $48,025 and net sales of $425,000 for the current year.

Description of a contemporary family issue : The purpose of this paper is to demonstrate familiarity with a theory or framework studied in the Families and Society course and the ability to apply that perspective to a description of a contemporary family issue you have either read about in t..

Identify the accounting principle that would be violated : If the controller accepted to record a QAR 70,000 warranty expense in 2015, would this be counted as a violation to the generally accepted accounting principles? Identify and discuss the accounting principle that would be violated, if any.

Determination of the concentration of phosphoric acid : Tammy applies the skills learned from the titration of vinegar exercise to the determination of the concentration of phosphoric acid necessary for her biology project. A total volume of 8.22 mL of 0.125 M potassium hydroxide solution was required to ..

Explain consequences of inadequate forensic psychological : Please provide a description of the two real-life examples you selected. Then explain the consequences of inadequate and/or incorrect forensic psychological evaluations in criminal matters. Finally, use the examples you selected to illustrate and ..

What is the yield to maturity on the bonds : Dan is considering the purchase of Super Technology, Inc. bonds that were issued 3 years ago. When the bonds were originally sold they had a 27-year maturity and a 6.27 percent coupon interest rate, paid annually. The bond is currently selling for $1..

Cultural change and project sponsorship : Cultural Change and Project Sponsorship

About the considering investing : Steve is considering investing $3,600 a year for 40 years. How much will this investment be worth at the end of the 40 years if he earns an average annual rate of return of 11.6 percent? Assume Steve invests his first payment of the end of this year.

User Account

All Pages