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
svetoff [14.1K]
3 years ago
5

What is the ph of a solution containing 0.12mol/l of nh4cl and 0.03 mol/l of naoh (pka is 9.25)?

Chemistry
2 answers:
Alborosie3 years ago
6 0
Given the following:

Concentration of residual (NH4)+  = 0.12 - 0.03 = 0.09 mol / L 
Concentration of created NH3       = 0.03 mol / L 

The (NH4) + reacts with all (OH)- to form NH3 and H2O ( Water ) 

The resultant solution is NH4+ / NH3 buffer system in which (NH4)+ is acid  and the NH3 is base or as called the salt.

For a buffer system : 

pH    = pKa + Log (acid) / (salt)         
          = 9.25 + Log [ (NH4)+ ] / [ NH3 ]         
          = 9.25 + Log [ 0.09 ] / [ 0.03 ]         
          = 9.25 + Log 3         
          = 9.25 + 0.4771         
pH    = 9.7271 or 9.73 which is rounded up to 2 decimal places
kari74 [83]3 years ago
4 0

Answer:

pH = 8.77

Explanation:

The reaction between Ammonium chloride and sodium hydroxide yield the following products depicted in the ICE table below:

               NH_{4}Cl + NaOH\rightarrow NH_{3} + H2O + NaCl

Initial    0.12 M        0.03 M            -     -     -

Change -0.03 M    -0.03 M          +0.03 M

Eq         (0.12-0.03)   (0.03-0.03)  +0.03 M  

Therefore,

[NH_{4} Cl] = 0.12-0.03= 0.09 M\\

[NH_{3}] = 0.03 M

This is a buffer with pKa = 9.25

Based on the Henderson-Hasselbalch equation:

pH = pKa + log\frac{[NH3]}{[NH4Cl]}

pH = 9.25 + log\frac{[0.03]}{[0.09]}=8.77               

You might be interested in
Why don’t we include the mass of an atoms electrons in the atomic mass?
Daniel [21]

Because Electrons have a negative charge

8 0
3 years ago
Which electron dot diagram represents H2?
Marizza181 [45]

Answer:

H:H

Explanation:

7 0
3 years ago
what is the effect of using higher concentration of sodium hydrogen carbonate on the rate of reaction?
Alex
Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.

Reaction rate increases with concentration, as described by the rate law and explained by collision theory. As reactant concentration increases, the frequency of collision increases. The rate of gaseous reactions increases with pressure, which is, in fact, equivalent to an increase in concentration of the gas.
7 0
2 years ago
What is the primary reason that atomic radius decreases as you move from left to right across the periodic table even through th
Anika [276]

Answer:

As you move across a period the electrons are being added to the same shell. But, protons are being added as well. This makes the nucleus more positively charged and, increasing protons has a greater effect than electrons. So, there is a greater nuclear attraction and, because the electrons are being added to the same shell that shell gets pulled in more. This causes a decrease in atomic radius.

Explanation:

5 0
3 years ago
What happens if you are in a swimming<br> pool and you push a beach ball down<br> with your hands?
Aleksandr-060686 [28]

Answer:

it will float back up because it's not dense enough to go down

7 0
3 years ago
Other questions:
  • A sample is left on the desk over several hours. On examination, the crystals appear moist, andliquid is forming around them. Th
    9·1 answer
  • If the heating curve is reversed, what describes the boiling point?
    9·1 answer
  • If 3.11 mol of an ideal gas has a pressure of 2.91 atm and a volume of 78.13 L, what is the temperature of the sample in degrees
    10·1 answer
  • The colour imparted to a flame by calcium ion?
    14·1 answer
  • What is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen?
    15·1 answer
  • Chemical reaction to make a foam?​
    8·1 answer
  • What is the most highly populated rotational level of Cl2 (i) 25deg C and (ii) 100 deg C? Take B=0.244cm-1.This question should
    10·1 answer
  • Which of the following is formed when a barium atom achieves an octet?
    9·1 answer
  • If water is added to 50 ml of a 0. 04 M solution so that it fills a 200 ml beaker, what is the final concentration? M.
    9·1 answer
  • Based on the image below, which item is your limiting reactant?(A) Ice cream scoopB) Cone(C) Cherry
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!