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
PolarNik [594]
3 years ago
10

You have a vial that may contain lead(II) cations or barium cations, but not both. Available to you are solutions of ammonium su

lfate, sodium fluoride and potassium bromide. Which single solution can you add to the vial to determine which cation is present?
Chemistry
1 answer:
Bess [88]3 years ago
3 0

Answer:

We should add, the KBr solution.

Explanation:

The vial contains Ba²⁺  and Pb²⁺

Our solutions are: (NH₄)₂ SO₄, NaF and KBr

We dissociate the solutions:

(NH₄)₂ SO₄  → 2NH₄⁺ + SO₄⁻²

NaF → Na⁺ + F⁻

KBr → K⁺ + Br-

When we add ammonium sulfate and sodium fluorine, we are adding sulfates and fluorines, but these two anions make precipitate both cations, we can not determine, if the vial contains Ba²⁺ or Pb²⁺

SO₄⁻²(aq) + Ba²⁺ (aq) → BaSO₄ (s)  ↓

SO₄⁻² (aq)+ Pb²⁺(aq)  → PbSO₄ (s)  ↓

2F⁻ (aq) + Ba²⁺ (aq) → BaF₂ (s) ↓

2F⁻ (aq) + Pb²⁺ (aq) → PbF₂ (s)  ↓

When we add the KBr, bromides only make precipitate with Pb²⁺, so the vial has only Pb²⁺ cation:

2Br⁻ (aq) + Ba²⁺ (aq) → BaBr₂ (aq)

2Br⁻ (aq) + Pb²⁺ (aq) → PbBr₂ (s) ↓

You might be interested in
What do the coefficients located before certain molecules in each chemical equation represent?
olga55 [171]
It represents the number of moles required of that molecule to balance the chemical equation, which means to have the reaction chemically happen and goes to completion.

For example:
CH4 + O2 --> H2O + CO2     that is not balanced

with the coefficients located
CH4 + 2O2 --> 2H2O + CO2    now with the coefficients the number of oxygen and hydrogen on each side are equal
6 0
3 years ago
Which statement explains how the Sun influences movement in the Earth's atmosphere?
MakcuM [25]
Correct Answer: The Sun heats the Earth unevenly; this heating pattern then causes convection currents in the atmosphere.
4 0
3 years ago
In the periodic table, a set of properties repeats from
jok3333 [9.3K]

in the periodic table, a set of properties repeats from row to row

3 0
3 years ago
Read 2 more answers
if theres no coefficient on a element symbol, is the power automatically 1 like it would be if there was no subscript?
Ivenika [448]
Yup go this website for more information http://dwb.unl.edu/calculators/activities/BalEqn.html
5 0
3 years ago
……….CO + ………H2 --> C8H18 + ……… H2O
Ksenya-84 [330]

Answer:

8CO + 17H2 = C8H18 + 8H2O

8, 17, 1, 8

5 0
3 years ago
Other questions:
  • An element's atomic number is the _____?
    7·2 answers
  • Write the chemical equation for the reaction of Fe(II) ion (Fe2 ) with phenanthroline. (Use the abbreviation phen for the phenan
    15·1 answer
  • A lab group was measuring the mass of an object. They recorded the following masses for the same object: 12.13 g, 12.12 g, 12.13
    10·1 answer
  • What reaction conditions most effectively conver a cabocxylic acid to a methly ester?
    8·1 answer
  • Why do we see different phases of the lunar cycle?
    5·1 answer
  • Write the balanced reaction using the fewest whole number coefficients to describe the reaction between gaseous hydrogen and gas
    6·1 answer
  • Which of the following chemical formulas show three molecules of a compound that has one
    15·1 answer
  • Which law states that the volume and absolute temperature of a fixed quantity of gas are directly proportional under
    10·1 answer
  • 3.2<br>Differentiate between a Merger and Alliance<br>(​
    5·2 answers
  • Explain the difference between a polar bond and a polar molecule.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!