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IrinaVladis [17]
3 years ago
10

Professionals in a scientific laboratory and in the healthcare field need to accurately prepare solutions for a number of reason

s. If you wear contacts, you probably use a saline solution to rinse your contacts. What solutions do you use at work? How would you calculate the amount of solute to the solvent to prepare this solution? If you do not wear contacts but you use or make cleaning solutions for your housework, how would you accurately prepare solutions to clean? What solutions do you use that use percent concentration? Please give an example
Chemistry
1 answer:
Nana76 [90]3 years ago
4 0

Answer:

Solutions are made up of two components; these are the solutes and the solvent. knowing the exact amount of each of this within a solution is important for scientists ; this is mostly expressed as concentrations of solutions

Explanation:

The concentration of solutions are usually expressed using different annotations. it can be expressed as molarity, %w/v, %w/w, %v/v.

To calculate the amount of solute needed to prepare a solution , one must understand the unit used to express the concentration of the solution

For example, a 10%w/v solution of NaOH means the solution contains 10 g of NaOH pellets dissolved in 100 mL of distilled water .

i use 0.25M sucrose solution more in my laboratory and i prepare

0.25 M means in 1000 ml of sucrose solution there is 0.25 mole of sucrose ;

no of mole =  mass/molar mass

molar mass of sucrose is 342.297 g/mol thus

mass = no of mole x molar mass

0.25 mol x 342.297 g /mol

= 85.57 g

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What mass of iron is needed to react with sulfur in order to produce 96 grams of
fiasKO [112]

Answer:

51.69 g of Fe

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2Fe + 3S —> Fe₂S₃

Next, we shall determine the mass of Fe that reacted and the mass of Fe₂S₃ produced from the balanced equation. This can be obtained as follow:

Molar mass of Fe = 56 g/mol

Mass of Fe from the balanced equation = 2 × 56 = 112 g

Molar mass of Fe₂S₃ = (2×56) + (3×32)

= 112 + 96

= 208 g/mol

Mass of Fe₂S₃ from the balanced equation = 1 × 208 = 208 g

SUMMARY:

From the balanced equation above,

112 g of Fe reacted to produce 208 g of Fe₂S₃.

Finally, we shall determine the mass of Fe needed to produce 96 g of Fe₂S₃. This can be obtained as follow:

From the balanced equation above,

112 g of Fe reacted to produce 208 g of Fe₂S₃.

Therefore, Xg of Fe will react to produce 96 g of Fe₂S₃ i.e

Xg of Fe = (112 × 96)/208

Xg of Fe = 51.69 g

Thus, 51.69 g of Fe is needed for the reaction.

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What is the difference in mesomeric and electromeric effect​
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A certain half-reaction has a standard reduction potential -1.33V . An engineer proposes using this half-reaction at the anode o
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Answer:

a. -0.63 V

b. No

Explanation:

Step 1: Given data

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  • Minimum standard cell potential (E°cell): 0.70 V

Step 2: Calculate the required standard reduction potential of the cathode

The galvanic cell must provide at least 0.70V of electrical power, that is:

E°cell > 0.70 V    [1]

We can calculate the standard reduction potential of the cathode (E°cat) using the following expression.

E°cell = E°cat - E°an   [2]

If we combine [1] and [2], we get,

E°cat - E°an > 0.70 V

E°cat > 0.70 V + E°an

E°cat > 0.70 V + (-1.33 V)

E°cat > -0.63 V

The minimum E°cat is -0.63 V and there is no maximum E°cat.

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3 years ago
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