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Alex Ar [27]
2 years ago
15

Goodwin County has plenty of water. The residents of Goodwin County enjoy fishing, boating, and swimming in Goodwin Lake. The Go

odwin River feeds the lake. Precipitation from the area flows into the Goodwin River. A dam in the lake controls flooding. This section of the lake provides usable water to Goodwin County.
goodwin is a
watershed
collection area
divide
Chemistry
1 answer:
MrRa [10]2 years ago
5 0

Answer:

I am pretty sure it is a watershed

Explanation:

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How many grams of NaF should be added to 500 mL of a 0.100 M solution of HF to make a buffer with a pH of 3.2
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2.25g of NaF are needed to prepare the buffer of pH = 3.2

Explanation:

The mixture of a weak acid (HF) with its conjugate base (NaF), produce a buffer. To find the pH of a buffer we must use H-H equation:

pH = pKa + log [A-] / [HA]

<em>Where pH is the pH of the buffer that you want = 3.2, pKa is the pKa of HF = 3.17, and [] could be taken as the moles of A-, the conjugate base (NaF) and the weak acid, HA, (HF). </em>

The moles of HF are:

500mL = 0.500L * (0.100mol/L) = 0.0500 moles HF

Replacing:

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1.017152 = [A-] / [0.0500moles]

[A-] = 0.0500mol * 1.017152

[A-] = 0.0536 moles NaF

The mass could be obtained using the molar mass of NaF (41.99g/mol):

0.0536 moles NaF * (41.99g/mol) =

<h3>2.25g of NaF are needed to prepare the buffer of pH = 3.2</h3>
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