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
Oksanka [162]
2 years ago
14

How many mL (to the nearest mL) of 0.140-M KF solution should be added to 400. mL of 0.212-M HF to prepare a pH

Chemistry
1 answer:
love history [14]2 years ago
6 0

Answer:

205mL of 0.140M KF solution

Explanation:

<em>pH = 2.70 solution.</em>

<em />

It is possible to obtain the pH of the buffer of HF-KF using the H-H equation:

pH = pKa + log [KF] / [HF]

<em>Where pH is desire pH = 2.70</em>

<em>pKa is pKa of HF = 3.17</em>

<em>[KF] could be taken as moles of KF </em>

<em>And [HF] moles of HF: 400.0mL = 0.4L * (0.212mol/L) = 0.0848 moles of HF</em>

<em />

Replacing:

2.70 = 3.17 + log [KF] / [0.0848 moles HF]

-0.47 = log [KF] / [0.0848 moles HF]

0.3388 = [KF] / [0.0848 moles HF]

[KF] = 0.02873 moles of KF must be added.

In mL using concentration of KF (0.140M):

0.02873 moles KF * (1L / 0.140 mol) = 0.205L =

<h3>205mL of 0.140M KF solution</h3>
You might be interested in
24. All elements found on the left side of the Periodic Table of
SashulF [63]

Answer:

Metals are located on the left side of the periodic table and are generally shiny, malleable, ductile, and good conductors.

Explanation:

5 0
2 years ago
Read 2 more answers
Non metals are acidic in nature explain with an equation ​
natka813 [3]

When non metallic oxide for example SO2 dissolved in water it produces sulphurous acid. SO2 + H2O → H2SO3 When metallic oxide reacts with water it produces  Metal hydroxides. Na2O + H2O → 2NaOH

6 0
3 years ago
Two atoms that share one electron each between have a ?
evablogger [386]

Answer:

Covalent bond

Explanation:

A covalent bond is defined as the sharing of election pairs between atoms

8 0
3 years ago
Use the drop-down menus to select the correct name for each of the organic compounds.
Molodets [167]

Answer:

Here's what I get  

Explanation:

CH₃CH₂CH₂CH₂CH₂CH₃ —  hexane

CH₂=CHCH₂CH₂CH₂CH₃ —  hex-1-ene is the preferred IUPAC name (PIN). 1-Hexene is accepted

CH₃C≡CCH₃ —  but-2-yne (PIN); 2-butyne is accepted

CH₃CH(CH₃)CH₂CH₂CH₃ — 2-methylpentane

CH₃CH₂CHCICH₂CH₃ — 3-chloropentane

5 0
3 years ago
Read 2 more answers
Jupiters atmosphere is mostly made of ___
erastovalidia [21]
Jupiter's atmosphere is composed predominantly of hydrogen and helium, but if you have to select any one option then we can look at the percentage of existence of these elements that would be
<span>90 percent hydrogen.
remaining 10 percent is helium 
so choose Hydrogen.</span>
3 0
3 years ago
Other questions:
  • Christina is studying a sugar molecule known as ribose. The molar mass of ribose is 150r/mole. What is the mass of 5.0 moles of
    10·1 answer
  • Please use the values in the resources listed below instead of the textbook values. Under certain conditions the decomposition o
    14·1 answer
  • Think about a neutral magnesium atom.Then think of a magnesium ion with a 2+charge.How are they different?
    8·1 answer
  • Consider the process of diluting 1.2 M NH4Cl solution to prepare 1.4 L of a 0.25 M NH4Cl solution. Determine if each of the foll
    8·1 answer
  • The difference between non-spontaneous and spontaneous reactions is that non-spontaneous reactions:
    10·1 answer
  • Which method can be used to separate a mixture of ethanol and water into its
    14·2 answers
  • Names for following compounds.<br> a)CO²<br> b)NaCI<br> c)S²CI²<br> d)NaF
    5·1 answer
  • Why is HCI a strong acid and HCIO a weak acid?
    12·1 answer
  • Are new atoms made during a chemical reaction?
    10·1 answer
  • If you compare the mass of a
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!