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
Montano1993 [528]
1 year ago
15

A buffer is prepared by adding 150mL of 0.50 M NH3 to 250mL of 0.50 M NH4NO3. What is the pH of the final solution? (Kb for NH3

= 1.8 x 10^-5)
Chemistry
1 answer:
Juli2301 [7.4K]1 year ago
5 0

From the calculations, the pH of the final solution is 9.04.

<h3>What is the pH of the buffer?</h3>

We can use the Henderson Hasselbach equation to obtain the final pH of the solution in terms of the pKb and the base concentration.

Number of moles of salt = 250/1000 L * 0.5 M = 0.125 moles

Number of moles of base = 150/1000 L * 0.5 M = 0.075 moles

Total volume of solution = 250ml + 150ml = 400ml or 0.4 L

Molarity of base = 0.075 moles/ 0.4 L = 0.1875 M

Molarity of salt = 0.125 moles/ 0.4 L = 0.3125 M

pOH = pKb + log[salt/base]

pKb = -log(1.8 x 10^-5) = 4.74

pOH = 4.74 + log[0.3125/0.1875 ]

pOH = 4.96

pH = 14- 4.96

pH = 9.04

Learn more about pH:brainly.com/question/15289741

#SPJ1

You might be interested in
• An element in group 2, period 4 has similar properties with
babymother [125]

Answer:  Elements in Group 2

Explanation:  The periodic table was arranged by Dmitri Mendeleev specifically  around similarites in their chemical behaviors.  He found that as atomic number increases, at some point an element starts to react in a manner similar to a previous one.  When that happened, he would place the larger element under the smaller one, and eventually noticed a periodicity in the table.  Elements in a column (Groups) had similiar chemical properties.  We know today that these similarities are due to the electron configuration, and that these configurations repeat themselves.  He left gaps in the table when he could find an existing element with properties similar to others in that group.  I big leap of faith, but it worked.  Elements for those missing boxes were eventually discovered.

7 0
2 years ago
Consider the reaction of 19.0 g of zinc metal with excess silver nitrate to produce silver metal and zinc nitrate. The reaction
Alexeev081 [22]

Answer:

14.5 g silver

Explanation:

This is a problem using the stoichiometry of the reaction. First thing we need is the balanced equation:

   Zn + 2 AgNO3 ----------------------- 2 Ag + Zn(NO3)2

We know that 14.6 g of Zn did not reacted, then we can calculate the amount of Zn reacted and do the calculation given the above reaction.

amount Zn reacted: 19.0 -14.6 g Zn = 4.4 g Zn

atomic weight of Zn:  65.37 g/mol

mol Zn reacted: 4.4 g Zn x ( 1 mol Zn/ 65.37 g Zn) = 0.067 mol Zn

We know from the balanced equation that moles of Ag are produced from 1 mol Zn therefore the mol of Ag produced are:

0.067 mol Zn x 2 mol Ag/ 1mol Zn = 0.135 mol Ag

and the mass of silver then will be given by multiplying by the atomic weight of silver:

0.135 mol Ag x  107.9 g/mol = 14.5 g Ag

4 0
3 years ago
Which ones are false? need help please.
kirill [66]

Answer:

A.) False B.)False C.) True D.) False E.) False

Explanation:

5 0
3 years ago
Read 2 more answers
i wanna know why my mom seems to rather- dislike me?- i mean like is it horomonal issues or whatever?! ;_; im confus3d here. can
m_a_m_a [10]

Explanation:

wanna know why my mom seems to rather- dislike me?- i mean like is it horomonal issues or whatever?! ;_; im confus3d here. can this be counted for a science question?- im not sure. its 12:00AM rn and im actually confused as if this is science or just me wondering the m0st random thingalings. :'D

5 0
2 years ago
Match the humidities with their description.
Sloan [31]
1. C
2. D
3. A
4. B

Hope this helped! Please brainliest!
8 0
3 years ago
Other questions:
  • A balloon is filled with 3.0 l of helium at 20oc. at what temperature will the balloon be one-half that volume (1.5 l
    5·1 answer
  • A solution of NaCl has a concentration of 1.50 M. The density of the solution is 1.06 g/mL. What is the concentration solution b
    15·2 answers
  • PLZZ HELP!!!
    7·1 answer
  • Rocks discovered on the moon are similar to those found _____. near volcanoes in river beds along the grand canyon
    6·1 answer
  • A 1.0-mole sample of krypton gas has a mass of
    7·1 answer
  • Name the five methods used for the formation of salts??
    7·1 answer
  • If a combination reaction takes place between rubidium and bromine, the chemical formula for the product is
    8·1 answer
  • What name is given to this molecule? a. A positively charged molecule. b. This molecule consists of three hydrogen atoms bonded
    11·1 answer
  • while doing an experiment you got stuck and didn't know how to proceed what will you do to continue with the experiment​
    15·1 answer
  • If the experiment were repeated using a cuvettes with a path length of 2.0 cm, how would that affect the absorbance values for t
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!