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
il63 [147K]
3 years ago
15

A buffer is prepared by dissolving 0.80 moles of NH3 and 0.80 moles of NH4Cl in 1.00 L of aqueous solution. If 0.10 mol of NaOH

is added to 250 mL of this buffer, what is the pH of the resultant solution?
a.10.54
b.4.27
c.8.78
d.9.73
e.5.22
Chemistry
1 answer:
Vikki [24]3 years ago
7 0

Answer:

a. 10.54

Explanation:

reaction is

NH₃ +  NaOH   -----------------NH₄Cl + H₂O

0.10 mol NaOH will consume 0.10 mol NH₃ thereby decreasing the initial amount of moles NH₃ and increasing that of NH₄Cl

mol NH₃  = 0.80 - 010 = .70

mol NH₄Cl = 0.80 + .10 = 0.90

pH = pKₐ + log (( NH₃/NH₄Cl))

pH =  9.26 + log (( 0.90 + 0.70)) = 9.26 + 0.11 = 10.54

You might be interested in
1. List three factors that can cause a chemical reaction to proceed faster.
Luba_88 [7]

Explanation:

1. The three factors are;

- Increasing the surface area of the reactants

- Using a catalyst

- Increasing temperature

2. Raising the temperature of a reaction mixture is the same as increasing the kinetic energy of the reacting molecules.

3. This reaction is an exothermic reaction. In exothermic reaction, the temperature of the system (mixture) decreases while that of the surroundings increases.

4. Reactions that releases energy to the surroundings are exothermic reactions.

5. All the options is an example of exothermic process because heat is being removed from the system except;

B. Evaporation of water - This is because it must absorb heat from the surroundings making it endothermic.

6 0
3 years ago
Hydrogen ions _____.
andreev551 [17]

are hydrogen atoms which have lost protons

5 0
3 years ago
Read 2 more answers
MOLE CONVERSIONS
madam [21]

Answer:

1.    6.116x1024 Molecules of H2O

2.    13400 L

3.    8.001x1024 Molecules of Mg3(PO4)2

4.    572 g.

5.    1.017x1025 Molecules of N2

6.    7.24 g

.7.     6980 g. of Al(OH)3

8.    3H2 + N2    => 2NH3

9.    S8 + 8O2   => 8SO2

10.  Ni(ClO3)2→     NiCl2   +  3O2

11.  C2H4      +      3O2→      2CO2      +     2H2O

12.  2KClO3→      2KCl      +      3O2

13.  Cu(OH)2   +   2HC2H3O2→     Cu(C2H3O2)2      +     2H2O

14.  C3H8      +      5O2→      3CO2      +      4H2O

15.  191 g of CO

4 0
3 years ago
A solar heating specialist is considering paraffin (Cp = 2.90 J/g O C) as a storage material for heat. How many kg of paraffin w
Stels [109]

Answer:

Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg

Explanation:

Specific heat capacity of paraffin, Cp = 2.90 J/g.°C = 2900 J/kg.°C

Specific heat capacity of water = 4.20 J/g.°C = 4200 J/kg.°C

Amount of heat energy that can be stored by 4.73 * 10³ kg of water heated through a degree rise in temperature can be calculated as below:

Using  H = mCpθ where m is mass of substance, Cp is specific heat capacity and θ is temperature change

H = 4.73 * 10³ kg * 4200 J/kg.°C * 1°C

H = 19866000 J

Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10 3 kg of water for a degree rise in temperature is calculated as follows:

H = mCpθ

19866000J = m * 2900 J/kg.°C * 1°C

m = 19866000J / 2900 J/kg

m = 6850.34 kg = 6.85 * 10³ kg

Therefore, mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg

7 0
3 years ago
In the polymerization of dna, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and _____
Llana [10]
In the polymerization of dna, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and  <span>the OH </span>of the last nucleotide in the polymer.
6 0
3 years ago
Read 2 more answers
Other questions:
  • If you used the method of initial rates to obtain the order for no2, predict what reaction rates you would measure in the beginn
    10·1 answer
  • Which ion would you expect to have the larger radius Na+ or Mg2+
    8·1 answer
  • Is zinc oxide a chemical or physical change when heated?
    7·1 answer
  • Solution 1 consists of 80% benzene and 20% toluene. Solution 2 consists of 30% benzene and 70% toluene. a) How many mL of Soluti
    8·1 answer
  • Assuming the volume is constant, if a gas has an initial pressure of 84.0 kPa at 30.0°C, what would the new pressure be at 240.0
    13·2 answers
  • How many grams of ammonium sulfide are in 2.35 mile of ammonium sulfide
    9·1 answer
  • All compounds of carbon are made by _____.
    13·1 answer
  • Hydrogen can be produced according to the following word equation
    12·1 answer
  • Which statements describe or apply the principal of conservation of energy? Select all that apply.
    5·2 answers
  • Which ideas held by the ancient Greeks have been at least partially supported by scientific experiments, calculations, and obser
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!