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liq [111]
2 years ago
8

Help I really help on this

Chemistry
1 answer:
nikdorinn [45]2 years ago
8 0
I think it’s C but not certainly positive
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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
Which statement best describes how a salmon's tail fin helps it to survive?
deff fn [24]

Answer:

c

Explanation:

all fins are for movement

8 0
3 years ago
A scientist has two substances that she is testing in her lab: a pink
ankoles [38]

Answer:

Weaker attraction between its molecules than the green substance. It's molecules now move away from each other.

Explanation:

Liquid to gas.

3 0
2 years ago
You can practice converting between the mass of a solution and mass of solute when the mass percent concentration of a solution
Ostrovityanka [42]

Answer:

145 grams of a 0.480 % KCN solution contains 697 mg of KCN.

Explanation:

w/w % : The percentage mass or fraction is mass of the of solute present in 100 grams of the solution.

w/w\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100

given =  w/w% = 0.480 %

Mass of solute that KCN = 697 mg = 0.697 g

(1 mg = 0.001 g)

Mass of the solution = ? = x

0.480\%=\frac{0.697 g}{x}\times 100

x=\frac{0.697 g}{0.480}\times 100

x = 145.21 g ≈ 145 g

145 grams of a 0.480 % KCN solution contains 697 mg of KCN.

6 0
3 years ago
The ratio of atoms of potassium to ratio of atoms of oxygen is
DanielleElmas [232]
The ratio of atoms of potassium to ratio of atoms of oxygen is 2:1
5 0
3 years ago
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