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
saw5 [17]
3 years ago
9

A. Match each type of titration to its pH at the equivalence point.

Chemistry
1 answer:
maks197457 [2]3 years ago
3 0

Answer:answers are in the explanation

Explanation:

(a). pH less than 7 between 1 - 3.5 are strong acid, and between 4.5-6.9 weak acid.

pH greater than 7; between 10-14 is a strong base, and between 7.1 - 9, it is weakly basic.

(b). Equation of reaction;

HBr + KOH ---------> KBr + H2O

One mole of HBr reacts with one mole of KOH to give one Mole of KBr and one mole of H2O

Calculating the mmol, we have;

mmol KOH = 28.0 ml × 0.50 M

mmol KOH= 14 mmol

mmol of HBr= 56 ml × 0.25M

mmol of HBr= 14 mmol

Both HBr and KOH are used up in the reaction, which leaves only the product,KBr and H2O.

The pH here is greater than 7

(C). [NH4^+] = 0.20 mol L^-1 × 50 ml. L^-1 ÷ 50 mL + 50mL

= 0.10 M

Ka=Kw/kb

10^-14/ 1.8× 10^-5

Ka= 5.56 ×10^-10

Therefore, ka= x^2 / 0.20

5.56e-10 = x^2/0.20

x= (0.20 × 5.56e-10)^2

x= 1.05 × 10^-5

pH = -log [H+]

pH= - log[1.05 × 10^-5]

pH = 4.98

Acidic(less than 7)

(c). 0.5 × 20/40

= 0.25 M

Ka= Kw/kb

kb= 10^-14/1.8× 10^-5

Kb = 5.56×10^-10

x= (5.56×10^-10 × 0.5)^2

x= 1.667×10^-5 M

pH will be basic

You might be interested in
What describes a mixture
kirill [66]

Answer:

a mixture is a material made up of two or more different substances which are physically combined.

4 0
3 years ago
Na2CO3 + CO2 + H2O → NaHCO3
Veseljchak [2.6K]

Answer:

i think the answer is d

Explanation:

8 0
3 years ago
Describe how hydrogen and oxygen form water.
bekas [8.4K]
Hydrogen and Oxygen by themselves have 1 and 6 valence electrons, respectively. 8 valence electrons is stable, so the atoms form bonds with each other to achieve 8 valence e-.

1 H atom + 1 H atom + 1 O atom = 8 valence e-
7 0
3 years ago
Read 2 more answers
The two main classes of mixtures are
Vesnalui [34]
Homogeneous or heterogeneous, Hope this helps!!
3 0
3 years ago
Read 2 more answers
A compound is 57.1% oxygen and the remainder carbon. using oxygen as the standard (16 amu) and assuming a 1:1 atom ratio, calcul
Delicious77 [7]
Let's start with the amount given in percent. Let our basis be 100 grams of compound. So, that means that in this amount, 57.1 g is oxygen and 100-57.1=42.9 g is carbon. Since there is 1:1 atom ratio, it also means that moles oxygen = moles carbon.

Moles = Mass/Relative Mass
Let x be the relative mass of oxygen

57.1/16 = 42.9/x
Solving for x,
<em>x = 12.02 amu</em>
4 0
3 years ago
Other questions:
  • 問上面照片的題目,何者不是構成蛋白質的主要成分原素?
    6·1 answer
  • What is the difference between creep and a landslide
    6·1 answer
  • What is necssesary for a plant to exhibit phototropism
    8·1 answer
  • What is the name of the compound Al2(SO3)3?
    7·2 answers
  • What is the mass in grams of 9.45*10^24 molecules of methanol (CH3OH)?
    5·1 answer
  • Flask is immersed in a large beaker of very hot water. At first, the level of the liquid in the tube falls, but after a short ti
    14·1 answer
  • 1. What is a chemical reaction
    11·2 answers
  • With Regular/Diffuse Reflection, the __________ of the object will determine the SHARPNESS of reflection
    10·1 answer
  • Climate change as we know it today is
    5·1 answer
  • Location E is located at the Tropic of Cancer, while location F is at the equator. Which location is likely to be warmer at the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!