![angelalovelis](/avatars/20523.jpg)
angelalovelis
19.07.2019 •
Chemistry
Alactic acid/lactate ion buffer solution contains 0.42 m hc3h5o3 and 0.60 m c3h5o3−, respectively. the ka value of lactic acid is 1.4×10−4. calculate the ph of this buffer.
Solved
Show answers
More tips
- H Health and Medicine How to Tan in a Tanning Bed? Tips and Recommendations...
- W Work and Career What is the Most In-Demand Profession in the Modern World?...
- A Auto and Moto How Can Parking Sensors Help Drivers?...
- H Health and Medicine What is the Normal Blood Sugar Level in a Healthy Person?...
- F Food and Cooking Red Caviar: How to Choose the Best?...
- C Computers and Internet Clearing Cache: How to Speed Up Your Browser...
- S Style and Beauty How are artificial nails removed?...
- S Style and Beauty Secrets of Tying a Pareo: 5 Ways...
- F Food and Cooking Everything You Need to Know About Pasta...
Answers on questions: Chemistry
- C Chemistry Why is electrolysis used to extract some metals...
- C Chemistry A student calculates the Keg value of a reaction in equilibrium to be 0.62. Which of the following is true of this reaction once equilibrium has been established?...
- C Chemistry how many atoms are there in 1g of argon the Avogadro constant is 6.02 x 10^23 per mole relative atomic mass (Ar): AR=40...
- C Chemistry A student calculates the keq value of a reaction in equilibrium to be 0.62. Which of the following is true of this reaction once equilibrium has been established?...
- C Chemistry Cann someone plss help me with this!!...
- C Chemistry Acomplete circuit contains two parallel-connected devices and a generator for providing the electromotive force. the resistance of the first device is 12 ohms, the...
- C Chemistry Acircuit contains two devices that are connected in parallel. if the resistance of one of these devices is 12 ohms and the resistance of the other device is 4 ohms,...
- C Chemistry What characteristics do all minerals share? pls i don t like this : (...
- C Chemistry Furan is readily acetylated on treatment with acetic anhydride and a Lewis acid, such as BF3. Predict the major regioisomer produced (A or B) in this reaction and...
- C Chemistry If the external vapor pressure is 2.0 atm , what is the vapor pressure of the water at its boiling point?...
Ответ:
c(lactic acid - C₃H₆O₃) = 0.42 M.
c(C₃H₅O₃⁻) = 0.60 M.
Ka(C₃H₆O₃) = 1.4·10⁻⁴.
pKa = -logKa = 3.85.
Henderson–Hasselbalch equation: pH = pKa + log(c(C₃H₅O₃⁻)/c(C₃H₆O₃)).
pH = 3.85 + log(0.60 M/0.42 M).
pH = 3.85 + 0.15.
pH = 4.00.
Ответ:
This in accordance with Boyle's law which states that the product of the initial pressure and volume is equal to the product of the final pressure and volume.
P1V1 = P2V2
Now compare this to Charles ' law which states that the product of the initial volume and the final temperature is equal to the product of the final volume and initial temperature.
V1T2= V2T1
Remember that all temperatures must be calculated in kelvin
If the initial temperature of 273 K is doubled to 546 K,
then a initial volume of 1.0 liter is also doubled, with a final volume of 2.0 liters.