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elena-14-01-66 [18.8K]
3 years ago
15

A graduated cylinder is filled to 15.6 mL with water and a piece of granite is placed in the cylinder,displacing the level to 17

.8mL. What is the volume of the granite piece in cubic centimeters?
Chemistry
2 answers:
Mars2501 [29]3 years ago
6 0
The volume of the granite piece is 2.2 (2.2 = 17.8-15.6) cubic centimeters. A graduate cylinder is a tool for measuring a volume of a liquid object. The granite piece's volume could be obtained by measuring the difference between the beginning of water volume and the latter water volume assuming there is no reaction between the water and the granite piece<span>. The cubic centimeter unit is equal the milliliter unit, so there is no conversion needed.</span>
d1i1m1o1n [39]3 years ago
3 0
The volume of the granite piece is simply the difference of the displaced volume level and the original volume of water which is 17.8 mL - 15.6 mL = 2.2 mL or 2.2 cm^3. This is by the Archimedes Principle where the volume of the object in the liquid would be equal to the volume displaced.
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Answer:

1.- pH =3.61

2.-pH =3.53

Explanation:

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In the second part, our strategy has to take into account that some of the weak base NO₂⁻ will be consumed by reaction with the very strong acid HCl. Thus, first we will calculate the new concentrations, and then find the new pH similar to the first part.

First Part

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Second Part

# mol HCl = ( 0.001 L ) x 12.0 mol / L = 0.012

# mol NaNO₂ reacted = 0.012 mol ( 1: 1 reaction)

# mol NaNO₂ initial = 0.170 mol/L x 1 L = 0.170 mol

# mol NaNO₂ remaining = (0.170 - 0.012) mol  = 0.158

# mol HNO₂ produced = 0.012 mol

# mol HNO₂ initial = 0.105

# new mol HNO₂ = (0.105 + 0.012) mol = 0.117 mol

Now we are ready to use the Henderson-Hasselbach with the new ration. Notice that we dont have to calculate the concentration (M) since we are using a ratio.

pH = 3.40 + log {0.158/.0117}

pH = 3.53

Notice there is little variation in the pH of the buffer. That is the usefulness of buffers.

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