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]
3 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20.0 mL of the diluted filtrate was then withdrawn and titrated with 5.20 mL of 0.01000 M standard solution of iodine.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]3 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
The energy transfer between the system and the surroundings, in the form of heat at constant pressure is described by which of t
kicyunya [14]
I think the answer would be d but not 100% sure
4 0
3 years ago
Arrange carbon, phosphorus and sulfur in order of reactivity to write their reaction with oxygen.
mihalych1998 [28]

Answer:

Solid phosphorus reacts with gaseous oxygen to produce solid diphosphorus pentaoxide. ... Methanol burns in oxygen to produce carbon dioxide gas and water vapor.

Explanation:

Solid phosphorus reacts with gaseous oxygen to produce solid diphosphorus pentaoxide. ... Methanol burns in oxygen to produce carbon dioxide gas and water vapor.

6 0
2 years ago
In what ways does solar radiation *benefit* and *harm* life on the planet
allochka39001 [22]
It benefits of the solar radiation for out planet is that it gives us heat, natural sunlight and its pollution free.The disadvantage for solar radiation is that there are also some toxic materials and hazardous products used during the manufacturing process of solar photovoltaic systems, which can indirectly affect the environment.

Hope I helped^^
8 0
3 years ago
How much heat does a 100. g sample of copper absorb when its temperature increases by 30.0°C? The specific heat of copper is 0.3
erica [24]

Answer:

\boxed {\boxed {\sf B. \ 1170 \ Joules }}

Explanation:

We are asked to find how much heat a sample of copper absorbs when the temperature is increased.

Since we know the mass, temperature increase, and specific heat capacity, we can use the following formula to calculate heat.

q= mc \Delta T

The mass of the copper sample is 100 grams, the temperature is changed or increased by 30.0 degrees Celsius, and the specific heat of copper is 0.39 Joules per gram degrees Celsius.

  • m= 100 g
  • c= 0.39 J/g °C
  • ΔT= 30.0 °C

Substitute the values into the formula.

q= (100 \ g )(0.39 \ J/g \textdegree C ) (30.0 \textdegree C )

Multiply the first two values. Note that the units of grams cancel.

q= 39 \ J/ \textdegree C (30.0 \textdegree C )

Multiply again, this time the units of degrees Celsius cancel.

q= 1170 \ J

The copper sample absorbs <u>1170 Joules</u> of heat and <u>Choice B </u>is correct.

7 0
3 years ago
What is the mass of 2.15 moles of calcium hydroxide, Ca(OH)2?
ch4aika [34]

159.3 g

mol= mass (g)/ molecular weight (g/mol)

3 0
3 years ago
Other questions:
  • Which statement describes the phrase change that occurs when dry ice is placed in an open container at room temperature
    7·1 answer
  • For the oxidation-reduction reaction equation given here 4ga+p4 indicate how many electrons are transferred in the formation of
    10·1 answer
  • Nickel has 28 protons if it has 31 neutrons, what is it’s atomic mass?
    7·1 answer
  • How many electrons does phosphorus have in its valence shell and neutrons in its nucleus, respectively?
    8·1 answer
  • Round to 4 significant figures.<br> 35.5450
    9·2 answers
  • Classify this reaction: 2Al+N2-&gt;AlN.
    11·1 answer
  • ;_; help please i need help TwT
    12·2 answers
  • Choose one natural resource that is nonrenewable. In three to five sentences, describe two impacts that come from obtaining this
    11·1 answer
  • What is ∆G system for the system that is described by the following data?
    15·1 answer
  • Katie's teacher has asked her to identify an unknown
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!