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
dimulka [17.4K]
2 years ago
11

An excess of zinc carbonate was added to a 20.0 mL solution X that contains sulfide and thiosulfate ions. Reaction occured accor

ding to the net ionic equation below:
S2- + ZnCO3 → ZnS + CO32-

Upon completion of the reaction, the solution was filtered into a 50.0 mL volumetric flask and diluted to the mark.

20.0 mL of the diluted filtrate was then withdrawn and titrated with 5.20 mL of 0.01000 M standard solution of iodine.

What is the concentration (in molarity) of thiosulfate ion in the initial solution X.
Chemistry
1 answer:
Helga [31]2 years ago
4 0

Answer:

0.0325M S₂O₃²⁻

Explanation:

Based on the reaction:

S²⁻ + ZnCO₃ → ZnS(s) + CO₃²⁻

<em>1 mole of S²⁻ reacts per mole of ZnCO₃</em>

when the reaction occurs, the sulfide ions are precipitated keeping in solution just S₂O₃²⁻ ions.

Then, these ions are titrated with iodine, thus:

2 S₂O₃²⁻ + I₂ → S₄O₆²⁻ + 2I⁻

That means 2 moles of thiosulfate react per mole of iodine.

Moles of iodine spent are:

5.20x10⁻³L ₓ (0.01000 mol / L) = 5.20x10⁻⁵ moles of I₂

5.20x10⁻⁵ moles of I₂ ₓ (2 moles S₂O₃²⁻ / 1 mole I₂) =

1.04x10⁻⁴ moles of S₂O₃²⁻

As dilution factor of the S₂O₃²⁻ solution was 50.0mL / 20.0mL = 2.5. Moles of the initial solution X are:

1.04x10⁻⁴ moles of S₂O₃²⁻ ₓ 2.5 = 1.60x10⁻⁴ moles of S₂O₃²⁻. In 20.0mL:

1.60x10⁻⁴ moles of S₂O₃²⁻ / 0.0200L =

<em>0.0325M S₂O₃²⁻</em>

<em></em>

You might be interested in
You have 0.5 l of air at 203 k in an expandable container at constant pressure. you heat the container to 273 k. what is the new
Leviafan [203]
0.593 L. V1/T1 = V2/T2
5 0
3 years ago
Give five properties of water.
Gelneren [198K]
Polarity, cohesion, adhesion, surface tension, high specific heat, and evaporating cooling
3 0
2 years ago
Read 2 more answers
What type of atom is hydrogen with an atomic mass of 1 and 2 electrons
Charra [1.4K]

Answer:

This would be the hydride ion where H gains an electron from a metal such as  Na

Explanation:

7 0
3 years ago
An electric range burner weighing 699.0 grams is turned off after reaching a temperature of 482.0°C, and is allowed to cool down
jasenka [17]

Answer:

0.42 J/gºC

Explanation:

We'll begin by calculating the heat energy used to heat up the water. This can be obtained as follow:

Mass (M) of water = 560 g

Initial temperature (T₁) = 22.7 °C

Final temperature (T₂) = 80.3 °C.

Specific heat capacity (C) of water = 4.18 J/gºC

Heat (Q) absorbed =?

Q = MC(T₂ – T₁)

Q = 560 × 4.18 (80.3 – 22.7)

Q = 2340.8 × 57.6

Q = 134830.08 J

Finally, we shall determine the specific heat capacity of the burner. This can be obtained as follow:

Mass (M) of burner = 699 g

Initial temperature (T₁) = 482.0°C

Final temperature (T₂) = 22.7 °C

Heat (Q) evolved = – 134830.08 J

Specific heat capacity (C) of the burner =?

Q = MC(T₂ – T₁)

–134830.08 = 699 × C (22.7 – 482.0)

–134830.08 = 699 × C × –459.3

–134830.08 = –321050.7 × C

Divide both side by –321050.7

C = –134830.08 / –321050.7

C = 0.42 J/gºC

Therefore, the specific heat capacity of the burner is 0.42 J/gºC

8 0
2 years ago
What is the molecular mass of Br 2?
Kazeer [188]

Answer:

159.808 g/mol

3 0
2 years ago
Read 2 more answers
Other questions:
  • If heat is released from water, what phase change occurs?
    11·2 answers
  • Which is not a functional group<br><br><br>A. Carboxyl <br>B. Halide<br>C. Hydroxyl<br>D. Protein
    12·1 answer
  • 4 Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piec
    15·2 answers
  • Akira records the speed of a reaction, first without a catalyst, and then with a catalyst
    10·2 answers
  • Which products would form if chlorine gas was bubbled through a solution of sodium bromide?
    6·1 answer
  • The temperature at which a substance in its solid state melts into the same substance in a liquid is known as
    9·1 answer
  • When you look out the window you can see constantly moving air.Air is cycled in order to reach equilibrium
    5·1 answer
  • Can anyone please help?
    10·1 answer
  • Nitrogen trioxide ionic covalent or both
    11·1 answer
  • in general, as the temperature increases, the solubility of gases in water ____ and the solubility of most solids in water___
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!