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
ludmilkaskok [199]
3 years ago
9

A sample of bleach was analyzed as in this procedure. The only procedural difference is that the student weighed out the bleach

solution used instead of pipetting a certain volume of bleach. The student weighed out 0.634 g of commercial bleach solution. It was found that it required 13.24 mL of 0.0732 M sodium thiosulfate solution to react with the iodine produced. What is the percentage of sodium hypochlorite in this bleach sample
Chemistry
1 answer:
Bogdan [553]3 years ago
6 0

Answer:

% = 5.69%

Explanation:

To do this, we need to write the equations taking place here. First, this is a REDOX reaction where the hypoclorite and thiosulfate solution reacts. The balanced equations are:

ClO⁻ + 2I⁻ + 2H⁺ -------> Cl⁻ +  I₂ + H₂O

I₂ + 2S₂O₃²⁻ -----------> 2I⁻ + S₄O₆²⁻

We already have the required volume and concentration of the thiosulfate solution, so we can calculate the moles of thiosulfate. With this moles, we can calculate the moles of hypochlorite, then the mass and finally the %.

The moles of thiosulfate would be:

moles S₂O₃²⁻ = V * M

moles S₂O₃²⁻ = 0.01324 * 0.0732 = 9.69x10⁻⁴ moles

Now according to the above reactions, we can see that

moles I₂ = moles ClO⁻

and

moles I₂ / moles S₂O₃²⁻ = 1/2

Therefore, let's calculate the moles of ClO⁻:

moles ClO⁻ = 9.69x10⁻⁴ / 2 = 4.845x10⁻⁴ moles

Now, we can calculate the mass of these moles, using the molar mass of sodium hypochlorite which is 74.44 g/mol:

m = 74.44 * 4.845x10⁻⁴

m = 0.036 g

Finally the % of this, in the bleach sample would be:

% = 0.036 / 0.634 * 100

<h2>% = 5.69%</h2>
You might be interested in
20 POINTS!!
Andrews [41]

Answer:

B. Interferon

Explanation:

interferon targets any lingering melanoma cells and prevents them from spreading and growing.

3 0
3 years ago
write chemical equations of photosynthesis and cellular respiration and show if carbon is oxidized or reduced
irina [24]

Answer:

Explanation:

  • The chemical reaction for cellular respiration  is as follows -

C₆H₁₂O₆ ( Glucose ) + 6 O₂ ( Oxygen ) --------------> 6CO₂  ( Carbon dioxide ) +  6H₂O ( Water ) + 38 ATP molecules ( Energy ) .

This is an example of oxidation of carbon .

  • The chemical reaction for photosynthesis  is as follows -

6CO₂  ( Carbon dioxide ) + 6H₂O ( Water ) --------------> C₆H₁₂O₆( Glucose ) + 6 O₂  ( Oxygen ).

This is an example of reduction of carbon .

6 0
3 years ago
How does a balanced chemical equation satisfy the law of conservation of mass
ELEN [110]
Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. ... When an equal number of atoms of an element is present on both sides of a chemical equation, the equation is balanced.
4 0
3 years ago
PLEASE HELP!!! Just need an answer, no explanation
Alex

Answer: N2

blah blah blah blah blah blah

6 0
3 years ago
Read 2 more answers
What are the smallest organelles in cell that are not enclosed in a membrance and they make protien
levacccp [35]
Ribosomes.ribosomes are small structures where proteins are made.Although they are not enclosed within a membrane,they are frequently considered organelles. Hope it helps :)
4 0
3 years ago
Other questions:
  • There are three different dichloroethylenes (molecular formula C2H2Cl2), which we can designate X, Y, and Z. Compound X has no d
    10·2 answers
  • Provide any explanation at the subatomic level for how flame color is produced. Your answer should include a discussion of the e
    7·1 answer
  • Select the physical properties. select all that apply. density hardness boiling point melting point reactivity fllammability
    15·2 answers
  • For the following reaction, 22.8 grams of diphosphorus pentoxide are allowed to react with 13.5 grams of water . diphosphorus pe
    9·1 answer
  • The difference between glycogen and amylopectin is:_________
    12·1 answer
  • Microorganisms have a major role in maintaining soil biodiversity. They recycle nutrients in ecosystems and decompose organic ma
    13·1 answer
  • Noble gases such as neon, argon, and krypton do not behave like regular main group elements. They do not like to give up or acce
    7·1 answer
  • The detector used in this experiment is called a Flame Ionization Detector (FID). As the different sample components come out of
    7·1 answer
  • Linda performed the following trials in an experiment.
    7·1 answer
  • How can a chemical reaction be sped up?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!