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3 years ago

11. The pH of an aqueous solution changes from 4 to 3 when the hydrogen ion concentration in the

Chemistry

1 answer:

Bogdan [553]3 years ago

4 0

decreases by a factor of 10. increases by a factor of 10.

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Which elements atomic radius changes the most in size when it becomes ionized?

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The element you are looking for is chlorine, i believe.

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3 years ago

Which one is a true statement about endothermic reactions? a: More heat is given off than is put into the reaction. b :The react

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4 years ago

How many mmoles are in 8.34 mol ?

borishaifa [10]

Answer:

8.34 moles

Explanation:

We are given 8.34 moles.

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4 years ago

The pH of a 0.15 M butylamine, C&H3NH2 solution is 12.0 at 25°C. Calculate the dissociation

Dmitrij [34]

The dissociation constant of the base : 7.4 x 10⁻⁴

<h3>Further explanation</h3>

Butylamine, C4H9NH2 Is A Weak Base

Kb is the dissociation constant of the base.

LOH (aq) ---> L⁺ (aq) + OH⁻ (aq)

$\rm Kb=\dfrac{[L][OH^-]}{[LOH]}$

[OH⁻] for weak base can be formulated :

$\tt [OH^-]=\sqrt{Kb.M}$

pH of solution : 12

pH+pOH=14, so pOH :

14-12 = 2, then :

$\tt [OH^-]=10^{-pOH}\\\\(OH^-]=10^{-2}$

the the dissociation constant (Kb) =

$\tt 10^{-2}=\sqrt{Kb.0.15}\\\\10^{-4}=Kb\times 0.15\\\\Kb=\dfrac{10^{-4}}{0.15}=6.6\times 10^{-4}$

Or you can use from ICE method :

C4H9NH2(aq) + H2O(l) ⇌ C4H9NH3+(aq) + OH-(aq)

0.15

x x x

0.15-x x x

$\tt Kb=\dfrac{x^2}{0.15-x}\rightarrow x=[OH^-]\\\\Kb=\dfrac{10^{-4}}{0.15-10^{-2}}=7.14\times 10^{-4}$

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3 years ago

How are magnetic objects able to be

Vadim26 [7]

Answer:

Explorations include static electricity, magnets, electromagnets and permanent magnets. Examples of cause and effect relationships could include how the distance between objects affects strength of the force and how the orientation of magnets affects the direction of the magnetic force.

Explanation:

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3 years ago