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3 years ago

What occurs when Cr^3+ ions are reduced to Cr^2+ ions?

1 answer:

7 0

D:

When electrons are gained, the charge of the atom decreases.

When you are given an atom with a charge, the oxidation of that atom is the charge. So by going from a Cr^3+ (Oxidation Number = 3) to a Cr^2+ (Oxidation Number = 2), the Oxidation Number thus decreases.

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The pH of a basic solution is 9.77. What is [OH⁻]?

uysha [10]

The [OH⁻] of the solution is 5.37×10⁵ M.

This is the negative logarithm to base 10 of hydroxy ion [OH⁻] concentration.

To calculate the hydroxy ion [OH⁻] concentration we use the formula below.

Note:

pH+pOH = 14

pOH = 14-pH
pOH = 14-9.77
pOH = 4.27

Formula:

[OH⁻] = 1/ $10^{pOH}$ ................. Equation 1

Given:

pOH = 4.27

Substitute the value into equation 1

[OH⁻] = 1/ $10^{4.27}$
[OH⁻] = 5.37×10⁵

Hence, The [OH⁻] of the solution is 5.37×10⁵ M.

Learn more about hydroxy ion concentration here: brainly.com/question/17090407

7 0

2 years ago

Read 2 more answers

Which compound are ionic and which are covalent? (N2) (CCl4) (SiO2) (AlCl3) (CaCl2) (LiBr)

muminat

Covalent compounds: N2, CCl4, SiO2 and AlCl3.

Ionic compounds: CaCl2 and LiBr.

Hope this helps!

3 0

3 years ago

Write the formula for calcium chloride. Explain how you determined this formula

hichkok12 [17]

Calcium forms an ion with a positive 2 charge and chlorine forms an ion with a negative one charg, so the formula is <span>CaC<span>l2</span></span>

Group 1 metals and group 2 metals form positive ions by losing 1 and 2 electrons respectively. Non-metals in group 17 gain 1, group 16 gain 2 and group 15 gain 3. Elements which lose electrons form positive ions while elements that gain electrons form negative ions.

To write a formula, you must balance charges so the overall charge is zero. A simple way to do this is to swap the # of the ion's charge and make it the subscript of the other ion. However, leave off the number 1 and reduce to lowest whole number ratio.

7 0

3 years ago

A container of gas is heated from 250 k to 303k. What is the new pressure if the initial pressure is 880kpa? (Assume constant vo

Anna [14]

So this is p1 over t1 = p2 over t2. So you do 880/250=x/303 and then cross multiply and divide

8 0

3 years ago

Which of these solutions is the most basic?

dalvyx [7]

<h2>Question↷</h2>

Which of these solutions is the most basic?

[OH-] = 4.3 x 10-9 M

[OH-] = 2.8 x 10-11 M

[OH-] = 6.7 x 10-10 M

[OH-] = 1.0 x 10-5 M

<h2>Answer↷</h2>

<u>[OH-] = 1.0 x 10-5 M</u> ✓

<h2>Solution↷</h2>

[OH-] = 4.3 x 10-9 M

[OH-] = 4.3 x 10^-9 M
pOH = - log [OH^1-]
pOH = - log [4.3 x 10^-9]
pOH = 8.36
pH = 14- 8.36
pH = 5.64

_______________________________________

[OH-] = 2.8 x 10-11 M

[OH-] = 2.8 x 10^-11 M
pOH = - log [OH^1-]
pOH = - log [2.8 x 10^-11 ]
pOH = 10.55
pH = 14-10.55
pH = 3.45

_______________________________________

[OH-] = 6.7 x 10-10 M

[OH-] = 6.7 x 10^-10 M
pOH = - log [OH^1-]
pOH = - log [6.7 x 10^-10]
pOH = 9.17
pH = 14-9.17
pH = 4.83

_______________________________________

[OH-] = 1.0 x 10-5 M

[OH-] = 1.0 x 10-5 M
pOH = - log [OH^1-]
pOH = - log [1.0 x 10^-5 ]
pOH = 5
pH = 14-5
pH = 9

_______________________________________

we know that , the solution with <u>pH > 7</u> is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is

<u>[OH-] = 1.0 x 10-5 M</u> with pH = 9

_______________________________________

4 0

2 years ago

Read 2 more answers