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4 years ago

Liquids take the shape of their

Chemistry

1 answer:

Irina18 [472]4 years ago

5 0

Liquids take the shape of their container.

Like pouring water into a cup would make the water settle into the shape of the cup.

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The ionization constant for acetic acid is 1.8 × 10-5, and that for hydrocyanic acid is 4 × 10-10.

mihalych1998 [28]

Answer:

D. [H+] of the acetic acid solution is greater than that of the hydrocyanic acid solution.

Explanation:

$CH_3 COOH(aq)+ H_2 O(l) CH_3 COO^- (aq)+H_3 O^+ (aq)$

Initial 0.1M 0 0

Change -x +x +x

Equilibrium 0.1M-x +x +x

$Ka =\frac {((x)(x))}{(0.1M-x)}$

$1.8\times10^{-5}= \frac {x^2}{(0.1M-x)}$

(-x is neglected) so we get

$1.8\times10^{-5}\times0.1=x^2\\\\x^2=1.8\times10^{-6}$

$x=\sqrt{x^2}=1.34\times10^{-3} M=H^3 O^{+}$ is the $[H^+ ]$ concnetration of acetic acid

$HCN(aq)+ H_2 O(l) CN^- (aq)+H_3 O^+ (aq)$

Initial 0.1M 0 0

Change -x +x +x

Equilibrium 0.1M-x +x +x

$Ka =\frac {((x)(x))}{(0.1M-x)}$

$4.0\times10^{-10}= \frac {x^2}{(0.1M-x)}$

(-x is neglected) so we get

$4.0\times10^{-10}\times0.1=x^2\\\\x^2=4.0\times10^{-11}$

$x=\sqrt{x^2}=6.32\times10^{-6} M=H^3 O^{+}$ is the $[H^+ ]$ concnetration of Hydrocyanic acid

Thus we see here, [H+] of the acetic acid solution $1.34 \times 10^{-3} M$ is greater than that of the hydrocyanic acid solution $6.32 \times10^{-6} M$

Please note∶

To find $[OH^- ]$ we use formula $[OH^- ]= \frac {kw}{([H^+])}$

The value of kw is 1.0×10^(-14)

The $[OH^- ]$ is lesser in each solution

3 0

3 years ago

How many grams of water can be heated from 25°C to 70°C using 15,000 J?

notsponge [240]

65 grams I think !!

3 0

3 years ago

A group of students is setting up a test to see whether earthworms, like those shown in the photo, prefer rough or smooth surfac

kotykmax [81]

Answer:

they like smooth

Explanation:

8 0

3 years ago

The complete combustion of copper(I) sulphide is according to the following equation:

MaRussiya [10]

Answer:

a) 7.94 x 10²³ molecules, b) 5.62 g SO2, c) 1.97 L

Explanation:

a) We need to first convert Cu2S to moles. Since molar mass of Cu2S is 159.14 g/mol, 14.0 g = 0.0880 mol. Using molar ratios (3 mol O2/2 mol Cu2S, 0.0880 mol of Cu2S = 0.132 mol O2. Since 1 mol contains 6.02 x 10²³ molecules, 0.132 mol O2 = 7.94 x 10²² molecules O2.

b) Since the molar ratios of Cu2S to SO2 is 1:1, 0.0880 mol of Cu2S produces 0.0880 mol SO2. To convert mol to grams, we use the molar mass of SO2 (64.06 g/mol) to figure out that 0.0880 mol SO2 = 5.63 g SO2.

c) At STP, 1 mol occupies 22.4 liters. 0.0880 mol SO2 x 22.4 L/1 mol = 1.97 L

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5 0

3 years ago

Please choose one of the choices

Georgia [21]

Answer:

A. the law of constant composition

Explanation:

The molecules in the container would have the same composition because they would have traded around atoms until an equilibrium was reached with every molecule having 1 Hydrogen and 1 Chlorine.

7 0

3 years ago