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xeze [42]
3 years ago
11

What is wrong with the following statement? Hal says that his teacher is solely responsible for preventing laboratory accident.

Chemistry
1 answer:
exis [7]3 years ago
3 0

Answer:

Hal is wrong because the teacher can instruct the student, but no make all the choices in a lab.Students must always wear ppe (personal protection equipment) , use proper lab protocol, and conduct themselves in a responsible manner. It is NOT the work of a teacher to ensure lab safety, but in fact the responsibility of said students.

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Determine moles of 1.5g of sodium carbonate.
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0.014mol

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Mass of Na₂CO₃  = 1.5g

Unknown:

Number of moles  = ?

Solution:

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  Number of moles  = \frac{mass}{molar mass}  

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what is the molarity of a solution of sodium hydroxide if it 15.0 mL requires 25.0 ml of 0.25M HCl to reach the end point
DaniilM [7]

Answer:

0.42 M

Explanation:

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

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From the balanced equation above,

The mole ratio of acid, HCl (nₐ) = 1

The mole ratio of base, NaOH (n₆) = 1

Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:

Volume of acid, HCl (Vₐ) = 25 mL

Molarity of acid, HCl (Mₐ) = 0.25 M

Volume of base, NaOH (V₆) = 15 mL

Molarity of base, NaOH (M₆) =?

MₐVₐ / M₆V₆ = nₐ/n₆

0.25 × 25 / M₆ × 15 = 1

6.25 / M₆ × 15 = 1

Cross multiply

6.25 = M₆ × 15

Divide both side by 15

M₆ = 6.25 / 15

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Therefore, the molarity of the base, NaOH is 0.42 M

6 0
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