All categories

3 years ago

Is making salt water to gurgle for a sore throat a physical or chemical change

Chemistry

1 answer:

Rus_ich [418]3 years ago

4 0

The answer is Physical Change.

You might be interested in

Determine the ph of a 0. 35 m aqueous solution of CH3NH2 (methylamine). The kb of methylamine is?

guajiro [1.7K]

The pH of 0.35 M of CH₃NH₂ is 12.09 and the $k_b$ for methylamine is 4.4 x 10⁻⁴.

pHis the quantitative measure of acidity and basicity of an aqueous or other liquid solution. The scale range goes from 0 to 14. Water has a pH of 7 and is neutral in nature.

<h3>What is dissociation constant?</h3>

The dissociation constant is an equilibrium constant that describes the dissociation or ionization of a base or an acid

$k_a$ describes the dissociation of an acid

$k_b$ describes the dissociation of a base

For methylamine,

$CH_3NH_2 + H_2O\Leftrightarrow CH_3NH_3^+ + OH^-$

Initial concentration of methylamine = 0.35 M

Initial concentration of products = 0

Let, at equilibrium concentration of CH₃NH₂ = 0.35 - x

Then, concentration of CH₃NH₃⁺ and OH⁻ is x and x respectively

$k_b = \frac{[CH_3NH_3^+] [OH^-]}{[CH_3NH_2]}$

The dissociation constant for methylamine, $k_b$ = 4.4 x 10⁻⁴

$4.4 \times 10^-^4 = \frac{x.x}{0.35} \\x^{2} = 4.4 \times 10^-^4 \times 0.35\\x^{2} = 1.54 \times 10^-^4 \\$

$x =0.0124$

pOH = -log[OH] = -log(0.0124) = 1.91

pH + pOH = 14

pH = 14 - 1.91 = 12.09

Thus, the pH of methylamine is 12.09 and $k_b$ is 4.4 x 10⁻⁴

Learn more about pH:

brainly.com/question/172153

#SPJ4

7 0

2 years ago

Which of the following elements is most likely to form a +1 charge?<br><br>Cl<br>Mg<br>Na<br>Li

pogonyaev

Answer:

Explanation:

because sodium has 1 electrons so it loses it to be stable and so have positive charge of 1

7 0

3 years ago

Read 2 more answers

The snake does not get as much energy from eating the same amount of food as the grasshopper. The statement that best explains w

mezya [45]

Answer:

Explanation:I got it right on the test

4 0

3 years ago

The attraction between oppositely charged ions is called

Irina18 [472]

Its called ionic bonding! :^)

3 0

3 years ago

Metals are used in many products because of the characteristic properties that most metals share. Which properties of the metal

kirill [66]

<span>I think the best answer among the choices is the third option. The properties which make tungsten useful in the thin, glowing filaments of light bulbs are it has a high melting point and is electrically conductive. Its melting point is around 1650 degrees Celsius. Of all metals, it is the highest and also it does not melt even though it is glowing.</span>

8 0

4 years ago

Read 2 more answers