Convert 1.25 atm to kPa

A solution with a pH = 13 has approximately how many moles of OH– ions per liter?

GuDViN [60]

Answer :

(A) The number of moles of $OH^-$ ions per liter is, 0.1 moles/L

(B) The number of molecules of $H^+$ ion is, $6.022\times 10^{10}$

(C) The pH of the solution will be, 4

Solution for part A :

First we have to calculate the pOH of the solution.

As we know that,

$pH+pOH=14\\\\13+pOH=14\\\\pOH=1$

Now we have to calculate the moles of $OH^-$ ion per liter.

$pOH=-\log [OH^-]\\\\1=-\log [OH^-]$

$[OH^-]=0.1moles/L$

Solution for part B :

First we have to calculate the $H^+$ ion concentration.

$pH=-\log [H^+]\\\\13=-\log [H^+]$

$[H^+]=10^{-13}moles/L$

Now we have to calculate the number of molecules of $H^+$ ion

As, 1 mole contains $6.022\times 10^{23}$ number of molecules of $H^+$ ion

So, $10^{-13}$ moles contains $6.022\times 10^{23}\times 10^{-13}=6.022\times 10^{10}$ number of molecules of $H^+$ ion

Solution for part C :

$pH=-\log [H^+]\\\\pH=-\log (1\times 10^{-4})$

$pH=4$

6 0

3 years ago

Read 2 more answers

SOMEONE PLEASE HELP ME ASAP PLEASE!!!!

emmainna [20.7K]

Answer:

(215 torr)(51 mL)=("x" torr)(18,500 mL) x = O.593 torr

5 0

2 years ago

How many grams of iron(III) oxide (Fe(OH)3) may theoretically be produced from 85.0 g FeCl3?

Crank

Answer:

56.0 g

Explanation:

Calculation of the moles of $FeCl_3$ as:-

Mass = 85.0 g

Molar mass of $FeCl_3$ = 162.2 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{85.0\ g}{162.2\ g/mol}$

$Moles= 0.52404\ mol$

According to the reaction:-

$FeCl_3+3 NaOH\rightarrow Fe(OH)_3+3 NaCl$

1 mole of $FeCl_3$ on reaction forms 1 mole of $Fe(OH)_3$

Also,

0.52404 mole of $FeCl_3$ on reaction forms 0.52404 mole of $Fe(OH)_3$

Moles of $Fe(OH)_3$ = 0.52404 moles

Molar mass of $Fe(OH)_3$ = 106.867 g/mol

Mass = Moles*Molar mass = $0.52404\times 106.867\ g$ = 56.0 g

8 0

2 years ago

If the salt created from the reaction of a strong acid and a weak base is added to a solution, what will happen to the solution

hoa [83]

Answer:

See Explanation

Explanation:

When a salt is dissolved in water, the solution could be acidic, basic or neutral depending on the nature of acid and base from which the salt was formed.

When a salt is formed from a strong acid and a weak base, the salt solution is acidic.

For instance, NH4Cl is a salt formed from NH3 which is a weak base and HCl which is a strong acid. The salt hydrolyses as follows;

NH4^+(aq) + H2O(l) ------> H3O^+(aq) + NH3(aq)

Hence an acidic solution is formed.

4 0

2 years ago

How many protons, neutrons and electrons are in a nitrogen atom?

inessss [21]

7 protons , 7 neutrons , 2,5 electrons.

7 0

3 years ago