Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Chemistry Expert

1. A solution of 0.100 M acetic acid is prepared.

a) What is its pH value?

b) If 20% of the initial acetic acid is converted to the acetate form by titration with NaOH, what is the resultant pH?

c) At what pH value would one expect to find a 1:1 ratio of the acetate and acetic acid forms?

d) At what pH value would one anticipate to find 10% of the total species (acetate + acetic acid) in the basic form?

e) At what pH value would one anticipate to find 90% of the total acetic acid species in the basic form?

2. Please refer to Section 1.1 – A Closer Look on page 9 of the text. Also consult A Closer Look 1.2 on page 10.

a) If initially the blood pH is 7.40, what is the concentration of CO2 in blood, assuming the pK’ and bicarbonate level in the section entitled A Closer Look 1.2?

b) What would be the consequence on blood pH of a 10% increase in the concentration of blood CO2?

c) If one wanted to return to initial pH of 7.40, given the change in concentration of CO2, to what concentration would the blood HCO3- need to be adjusted?

d) A patient has a blood concentration of CO2 of 0.6 mM. If the blood pH is 7.40, what is concentration of bicarbonate ion in the blood? If the blood [CO2] rises by 20% due to physiology, what is the new pH of the blood? What [HCO3-] would be required to keep the blood pH of 7.40, if the physiology keeps the [CO2] elevated?

3. Your technician comes to you to ask for help. You’ve asked that a pH 7.20 buffer of Na2HPO4/NaH2PO4 of total concentration 0.2 M be prepared. He tells you that he has found a stock solution of 0.2 M NaH2PO4 and asks how to make the buffer. He also informs you that he has no Na2HPO4 on hand, but that there is a supply of both concentrated HCl(aq) and NaOH(aq) in the lab. The lab is equipped with a pH meter.

Supposing that any amount of strong acid or base that can be added will not dilute the stock solution by much, what guidance can you give him? All that you want to achieve is the pH 7.20 (as measured by the pH meter) buffer at a total concentration of about 0.2 M. Is there a “quick and dirty” way to obtain the desired buffer? What will be the ratio of the two relevant phosphate forms if you have achieved the intended result? Figure 1.6 and the information on page 10 of the text should be of great help to you.

4. You are studying an enzyme with a histidine side chain that is included in enzymatic catalysis. It is thought that the basic form is important in catalysis. So, as part of your investigation of this enzyme, you wish to estimate the ratios of the basic and acidic forms of the histidine side chain at pH values of 6.0, 7.50 and 8.00. Assuming that the pK of the histidine in the enzyme protein is approximately equal to that in the free amino acid, find out numerical estimates of the ratios of the basic to the acid forms of the histidine residue side chain at the given pH va

Chemistry, Academics

  • Category:- Chemistry
  • Reference No.:- M91610

Have any Question? 


Related Questions in Chemistry

If it is considered that drinking 800 ml of water per day

If it is considered that drinking 800 mL of water per day containing an arsenic concentration equal to the US EPA maximum contaminant level (MCL), delivers the dose to an adult that corresponds to a 1 in 10,000 excess ri ...

A 010 m fes04 aq solution is electrolyzed between a

A 0.10 M FeS04 (aq) solution is electrolyzed between a magnesium cathode and a platinum anode with a current density of 1.50 mA cm-2.The hydrogen over potential is 0.60 V. What will be the concentration of Fe2+ions when ...

Explain why acidic rain produced as a result of excess

Explain why acidic rain produced as a result of excess sulphur dioxide in the atmosphere can cause degradation of buidings.

A 200 g sample of water with a temperature of 32c is added

A 200 g sample of water with a temperature of 32?C is added to 50 g water at 55?Cin an insulated container. What is the final temperature after thermal equilibrium is reached? The specific heat of water in the liquid sta ...

Analyzed individually two solutes have retention times of

Analyzed individually, two solutes have retention times of 17 s and 21 s with peak widths at half-maximum (w1/2) of 1.9 s and 2.8 s, respectively. If the two solutes are analyzed together, what would be the resolution on ...

When 450 g of an unknown nonvolatile nonelectrolyte is

When 45.0 g of an unknown nonvolatile nonelectrolyte is dissolved in 500.0 g of water, the resulting solution freezes at -0.930 °C. What is the molar mass of the unknown substance? K f  = 1.86 °C/ m  for water.

The combustion of so2g has keq560x104 at 350 degrees

The combustion of SO2(g) has Keq=5.60x10^4 at 350 degrees Celcius. If 0.350bar of SO2(g) and 0.762bar of O2(g) are mixed initially, what are the partial pressures of each of the three gases when the mixture reaches equil ...

Imagine you are performing a calorimetry experiment using a

Imagine you are performing a calorimetry experiment using a constant-pressure calorimeter. First, you calibrate the calorimeter using the reaction of KOH with HCl (enthalpy = -56.2 kJ/mol). Then, you use the calorimeter ...

For the reaction between permanganate ion and sufite ion in

For the reaction between permanganate ion and sufite ion in basic solution, the unbalanced equation is: MnO 4 -  + SO 3 2-   MnO 2  + SO 4 2- When this equation is balanced using the smallest whole number coefficients po ...

Dr pepper has 400g of sugar per 12 oz of liquid calculate

Dr. Pepper has 40.0g of sugar per 12 oz. of liquid. Calculate the molarity of this solution. Put that molarity into your regression line and calculate the density (all other things being equal) of this sugar solution. Sh ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro