![jonquil201](/avatars/4117.jpg)
jonquil201
27.02.2020 •
Chemistry
How many grams of sodium benzoate, C H CO Na, have to be added to 1.50 L of a 0.0200 M solution of benzoic acid, C H CO H, to make a buffer with a pH = 4.00, assuming no volume change?
Solved
Show answers
More tips
- S Style and Beauty How to Properly Tie a Tie: 5 Simple Steps...
- L Leisure and Entertainment How to Make a Crab Trap in Just a Few Minutes...
- H Health and Medicine How Much Does Abortion Cost? Expert Answers and Insights...
- S Sport How to Build Arm Muscles? Effective Exercises and Tips...
- H Health and Medicine When can it be said that a person has a normal pulse?...
- A Art and Culture When Will Eurovision 2011 Take Place?...
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
- F Family and Home Why Having Pets at Home is Good for Your Health...
- H Health and Medicine How to perform artificial respiration?...
- H Health and Medicine 10 Tips for Avoiding Vitamin Deficiency...
Answers on questions: Chemistry
- C Chemistry If two electrons are removed from beryllium during a reaction, which energy level becomes the valence shell?...
- C Chemistry If we place 0.00200 mol HCl (aq) and 0.00200 mol NaOH (aq) in our calorimeter with 50.0 mL (so 50 g) of water what is the final temperature of the solution? [Assume...
- C Chemistry Air that is less dense , while air that is more dense ....
- C Chemistry What type of energy is the transfer of heat? Question 2 options: sound potential thermal elastic...
- C Chemistry What process(es) creates ATP?...
- C Chemistry In your opinion to survival of the Fittest apply to humans yes or no explain why ...
- C Chemistry Help with this 2 other queastions NO cutt.ly/nz6VGda LINKS I have 86 points now because people were answering random #1 Clouds form from the process of water vapor...
- C Chemistry What is the specific heat capacity of an unknown metal if 75.00 g of the metal absorbs 418.6J of heat and the temperature rises 25.0°C?...
- C Chemistry What are ionic compounds...
- C Chemistry What type of energy is being produced by the flashlight? Question 1 options: nuclear motion radiant sound...
Ответ:
2.8275grams
Explanation: A buffer is made btw a weak acid and it salt. In a solution made by dissolving a weak acid in solution, equilibrium is set up btw ionised and unionised ion. For Benzoic acid
C6H5COOH> C6H5COO- + H+
Ka = [C6H5COO-] [H+]/ [C6H5COOH](1)
using Ka = 6.5× 10^-5, [C6H5COOH] = 0.02M. PH= - log[H+] > [H+]= 10^-4M.
Putting the values in(1)
[C6H5COO-]= 6.5× 10^-5 × 0.02/ 10^-4
[C6H5COO-] = 0.013M = Molarity of sodium benzoate
Mole(C6H5COONa) = 0.013 × Volume = 0.013mol/litre × 1.5 litre
Mole(C6H5COONa) = 0.0195mol
Mass(C6H5COONa) = 0.0195 × Molar mass
Mass(C6H5COONa) = 2.8275g
Ответ:
The mineral is broken. If it breaks evenly along a smooth line, it is said to have cleavage. If a mineral doesn't have cleavage, it will break in a ragged line. These minerals are said to have fracture.
Explanation:
Hope it help ;)