All categories

3 years ago

Calculate the ph of a solution that is 0.26 m in hf and 0.12 m in naf.

1 answer:

5 0

When a mixture consists of a weak acid, such as HF, and its corresponding salt, NaF, this is an acid buffer. So, we can use the equation as written below:

pH = pKa + log(salt/acid)

For HF, the pKa = 3.17

Thus,
pH = 3.17 + log(0.12/0.26)
<em>pH = 2.83</em>

You might be interested in

Check all that apply. Some of the characteristics that make a good index fossil are:

neonofarm [45]

I think it’s D, I could be wrong though

8 0

3 years ago

Read 2 more answers

What is the average isotopic mass of an element that has the following abundances in nature? Isotopic mass: X20 X22 X23 Abundanc

Paladinen [302]

Answer: 20.2

Explanation:

Mass of isotope 1 = 20

% abundance of isotope 1 = 90.5% = $\frac{90.5}{100}=0.905$

Mass of isotope 2 = 22

% abundance of isotope 2 = 8.0% = $\frac{8}{100}=0.08$

Mass of isotope 3 = 23

% abundance of isotope 3 = 1.5% = $\frac{1.5}{100}=0.015$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(20\times 0.905+(22\times 0.08)+(23\times 0.015]$

$A=20.2$

Therefore, the average atomic mass of the element is 20.2.

8 0

3 years ago

What trend in ionization do you see going up and down?

xxTIMURxx [149]

Depending if you were going up, you would be seeing an increase in relative ionization energies in a particular group on the periodic table, and vice versa, if you go down the group, an decrease in the relative ionization energies.

5 0

3 years ago

A 2.5 mol sample of phosphorus pentachloride, PCl5 dissociates at 160C and 1.00atm to give 0.338 mol of phosphorus trichloride a

Readme [11.4K]

Explanation:

Moles of phosphorus pentachloride present initially = 2.5 mol

Moles of phosphorus trichloride at equilibrium = 0.338 mol

$PCl_5\rightleftharpoons PCl_3+Cl_2$

Initially

2.5 mol 0 0

At equilibrium:

(2.5 - x) mol x x

So, from above, the moles of phosphorus trichloride at equilibrium , x= 0.338 mol

Mass of 0.338 moles of phosphorus trichloride at equilibrium:

= 0.338 mol × 137.5 g/mol = 46.475 g

Moles of phosphorus pentachloride present at equilibrium :

= (2.5 - 0.338) mol = 2.162 mol

Mass of 2.162 moles of phosphorus pentachloride at equilibrium:

= 2.162 mol × 208.5 g/mol = 450.777 g

Moles of chloride gas present at equilibrium : 0.338 mol

Mass of 0.338 moles of chloride gas at equilibrium:

= 0.338 mol × 71 g/mol = 23.998 g

3 0

3 years ago

Which type of radiation has the highest penetrating ability?

Ulleksa [173]

Gamma rays and x- rays have the highest penetrating power

8 0

3 years ago

Read 2 more answers