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2 years ago

I need help pls I will give you brainlist

Chemistry

1 answer:

White raven [17]2 years ago

5 0

Answer:

I think it is the second one

Explanation:

Because what the cold water did to the table salt, is that it separated its molecules dissolving the salt.

even though the rock salt was in hot water it was a bigger particle. But the big difference was only because the water temperature ️.

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A chemistry student weighs out 0.154 g of chloroacetic acid (HCH2CICO2) into a 250. mL volumetric flask and dilutes to the mark

erastovalidia [21]

Answer:

11.6 mL of 0.1400 M of NaOH is required to reach equivalence point.

Explanation:

Chloroacetic acid is an monoprotic acid.

Neutralization reaction: $ClCH_{2}COOH+NaOH\rightleftharpoons ClCH_{2}COONa+H_{2}O$

So, 1 mol of chloroacetic acid is neutralized by 1 mol of NaOH.

Molar mass of chloroacetic acid = 94.5 g/mol

So, 0.154 g of chloroacetic acid = $\frac{0.154}{94.5}$ moles of chloroacetic acid

= 0.00163 moles of chloroacetic acid

Lets assume V mL of 0.1400 M of NaOH is required to reach equivalence point.

So, number of moles of NaOH needed to reach equivalence point

= $\frac{0.1400\times V}{1000}$ moles

So, $\frac{0.1400\times V}{1000}=0.00163$

or, V = 11.6

Hence, 11.6 mL of 0.1400 M of NaOH is required to reach equivalence point.

7 0

3 years ago

What is the pH of a 0.1 M phosphate buffer (pKa = 6.86) that contains equal amounts of acid and conjugate base?

Anvisha [2.4K]

Answer : The pH of a 0.1 M phosphate buffer is, 6.86

Explanation : Given,

$pK_a=6.86$

Concentration of acid = 0.1 M

Concentration of conjugate base (salt) = 0.1 M

Now we have to calculate the pH of buffer.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=6.86+\log (\frac{0.1}{0.1})$

$pH=6.86$

Therefore, the pH of a 0.1 M phosphate buffer is, 6.86

4 0

3 years ago

A balloon is filled with 3.50 L of water at 24.0 C and 2.27 atm. If the balloon is placed outdoors on a hot day at a temperature

yan [13]

Answer:

3.51 L

Explanation:

3 0

3 years ago

From which source is pomace derived? (1 point)

GrogVix [38]

Answer: unused waste from food processing

Explanation: have you takin the chemical reaction system unit test yet? It’s alternated

6 0

2 years ago

Important functional groups in biomolecules include --------

Andrew [12]

B nucleic acids I think

4 0

3 years ago

Read 2 more answers