All categories

2 years ago

What is the hydroxide ion concentration in a solution of NH3 with a pOH of 4.65?

Chemistry

2 answers:

PtichkaEL [24]2 years ago

6 0

Answer : The hydroxide ion concentration in a solution of ammonia is, $2.2\times 10^{-5}M$

Explanation : Given,

pOH = 4.65

pOH : It is defined as the negative logarithm of hydroxide ion concentration.

Mathematically it is represented as :

$pOH=-\log [OH^-]$

$4.65=-\log [OH^-]$

$[OH^-]=2.2\times 10^{-5}M$

Therefore, the hydroxide ion concentration in a solution of ammonia is, $2.2\times 10^{-5}M$

Paul [167]2 years ago

5 0

-5
[OH-]=2.24 X 10 M

You might be interested in

What is the total mass of oxygen contained in 8.20g of benzoic acid (C6H5COOH)

VashaNatasha [74]

Answer:

Mass of oxygen = 2.2 g

Explanation:

Given data:

Mass of benzoic acid= 8.20 g

Mass of oxygen= ?

Solution:

Molar mass of oxygen = 16×2 g/mol

Molar mass of C₆H₅COOH = 7×12 + 1×6 + 2×16

Molar mass of C₆H₅COOH = 84 + 6 + 32

Molar mass of C₆H₅COOH = 122g/mol

Mass of oxygen in 8.20 g of C₆H₅COOH :

Mass of oxygen = 32 g.mol⁻¹/122 g.mol⁻¹ × 8.20 g

Mass of oxygen = 2.2g

4 0

2 years ago

If we start with 1.000 g of strontium-90, 0.805 g will remain after 9.00 yr. This means that the of strontium-90 is ________ yr.

lesantik [10]

The question is incomplete, here is the complete question.

If we start with 1.000 g of strontium-90, 0.805 g will remain after 9.00 yr. This means that the half-life of strontium-90 is ________ yr.

a. 28.8 b. 30.9 c. 35.4 d. 32.2

Answer : The half-life of strontium-90 is 28.8 years.

Explanation :

This is a type of radioactive decay and all radioactive decays follow first order kinetics.

First we have to calculate the rate constant.

Expression for rate law for first order kinetics is given by :

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant

t = time taken for decay process = 9.00 year

a = initial amount or moles of the reactant = 1.000 g

a - x = amount or moles left after decay process = 0.805 g

Putting values in above equation, we get:

$k=\frac{2.303}{9.00}\log\frac{1.00}{0.805}$

$k=0.0241\text{ year}^{-1}$

To calculate the half-life, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$0.0241\text{ year}^{-1}=\frac{0.693}{t_{1/2}}$

$t_{1/2}=28.8\text{ years}$

Therefore, the half-life of strontium-90 is 28.8 years.

5 0

2 years ago

A chemistry student needs 65.0 mL of carbon tetrachloride for an experiment. By consulting the CRC Handbook of Chemistry and Phy

Anna007 [38]

Answer:

103.3 g

Explanation:

Data Given:

Volume of carbon tetrachloride (v) = 65.0 mL

Density of carbon tetrachloride (d) = 1.59 g/cm³

Solution:

Convert volume of carbon tetrachloride from ml to cm³

1 ml = 1 cm³

so,

65.0 mL = 65.0 cm³

Formula used to calculated mass of carbon tetrachloride should be taken for experiment.

d = m/v

Rearrange the above equation:

m = d x v . . . . . . .(1)

Put values in equation 1

m = 1.59 g/cm³ x 65.0 cm³

m = 103.3 g

6 0

3 years ago

Que es magnitud, los tipos de magnitud y dar ejemplos de cada una de ella

Valentin [98]

Search Results
Featured snippet from the web
El Sistema Internacional de Unidades se basa en dos tipos de magnitudes físicas: Las siete que toma como unidades fundamentales, de las que derivan todas las demás. Son longitud, tiempo, masa, intensidad de corriente eléctrica, temperatura, cantidad de sustancia e intensidad luminosa.

7 0

3 years ago

If 6 moles of a compound produce 84 J of energy, what is the Alreaction in

Naddik [55]

answer : 14 J/mol

J/mol unit in the answers gives the hint as to what you should do which is divide the J from mol

J ÷ mol

84 ÷ 6 = 14

4 0

2 years ago