1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Diano4ka-milaya [45]
2 years ago
14

Given that 0.40 mols of NaCl was dissolved in water to create a

Chemistry
1 answer:
Marina86 [1]2 years ago
4 0
2.86 is the rong answer
You might be interested in
What is the ph of a soft drink in which the major buffer ingredients are 6.6 g of nah2po4 and 8.0 g of na2hpo4 per 355 ml of sol
Alex777 [14]
The Relative Formula Mass of NaH2PO4 is 120 g/mol
Therefore, the number of moles = 6.6/120
                                                   = 0.055 moles of NaH2PO4 which is also equal to the number of moles of H2PO4.
[H2PO4-] = Number of moles oof H2PO4-/Volume of the solution in L
  = 0.055/ ( 355 ×10^-3)
  = 0.155 M
Na2HPO4 undergoes complete dissociation as follows;
Na2HPO4 (aq)= 2Na+ (aq) + HPO4^2- (aq)

1 mole of Na2HPO4 = 142 g/mol
Therefore; number of moles = 8.0/142
                                             = 0.0563 moles
 [HPO4 ^-2] is given by no of moles HPO4^2- /volume of the solution in L
     = 0.0563/(355×10^-3)
     =  0.1586 M
Both H2PO4^2- and HPO4^2- are weak acids the undergoes partial dissociation 
Ka of H2PO4- = 6.20 × 10^-8
 [H+] =Ka*([H2PO4-]/[HPO4(2-)]
        = (6.20 ×10^-8)×(0.155/0.1586)
        = 6.059 ×10^-8 M
pH = - log[H+]
     = - log (6.059×10^-8)
     = 7.218

5 0
3 years ago
How many moles of oxygen are needed to react with 100.0 grams of aluminum?
Tasya [4]

Answer:

2

Explanation:

8 0
3 years ago
Calculate the mass, in grams, of 1.2000 mol Mg₃N₂
fredd [130]
So what do you want me to do
Explanation
7 0
2 years ago
The rows of the periodic table are called groups because similar elements reside next to each other on the modern periodic table
forsale [732]

Answer:

True

Explanation:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

3 0
3 years ago
Read 2 more answers
Which of these is the strongest acid?
sergejj [24]

Answer: D

Explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • describe how energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to
    13·1 answer
  • In order to draw a conclusion, scientists must_______ data from an investigation
    13·1 answer
  • Which value gives the number of particles in 1 mol of a substance?
    6·1 answer
  • Test (Speed, Velocity and Acceleration)
    14·1 answer
  • calculate how many milliliters of 0.142 M NaOH are needed to completely neutralize 21.4 mL of 0.294 M H2C4H4O6.
    12·1 answer
  • The conversion of methyl isonitrile to acetonitrile in the gas phase at 250 °C CH3CN(g) is first order in CH3NC with a rate cons
    7·1 answer
  • 7: How many times can a cell divide?
    10·1 answer
  • How do you identify an acid from its chemical formula​
    6·1 answer
  • An atom of carbon contains 6 total electrons. How many of these electrons are in s orbitals?
    14·1 answer
  • A sample of rock contains 80 grams of a parent radioactive isotope that has a half-life of 20 000 years. After 100 000 years, th
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!