Chemistry, 31.07.2019 19:10 brianlykid3042

Calculate the percent ionization of formic acid (hco2h) in a solution that is 0.125 m in formic acid. the ka of formic acid is 1.77 ⋅ 10-4. calculate the percent ionization of formic acid (hco2h) in a solution that is 0.125 m in formic acid. the ka of formic acid is 1.77 10-4. 0.859 0.0180 3.79 2.25 ⋅ 10-5 6.94

Answers: 1

Show answers

Answers

Answer from: huangjianhe135

Percent ionization of HCOOH is 3.69%

Explanation:

To calculate percent ionization of HCOOH, we have to construct an ICE table to determine changes in concentrations at equilibrium.

$HCOOH\rightleftharpoons HCOO^{-}+H^{+}$

I: 0.125 0 0

C: -x +x +x

E: 0.125-x x x

species inside third bracket represent equilibrium concentrations

So, $\frac{[HCOO^{-}][H^{+}]}{[HCOOH]}=K_{a}(HCOOCH)$

or, $\frac{x^{2}}{0.125-x}= 1.77\times 10^{-4}$

or, $x^{2}+0.000177x-0.0000221 = 0$

$x=\frac{-0.000177+\sqrt{(0.000177)^{2}+(4\times 0.0000221)}}{2}$

or, $x=4.61\times 10^{-3}$ M

So, $[H^{+}]=4.61\times 10^{-3}M$

Percent ionization of formic acid = $\frac{[H^{+}]}{initial concentration of HCOOH}\times 100$ = $\frac{0.00461}{0.125}\times 100$ = 3.69%

Answer from: Quest

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Another question on Chemistry

Chemistry, 22.06.2019 01:40

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Answers: 1

Answer

Chemistry, 22.06.2019 10:00

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Answers: 2

Answer

Chemistry, 22.06.2019 15:00

Answer explain why it is not possible to deduce a complete order of reactivity.

Answers: 3

Answer

Chemistry, 23.06.2019 00:00

How many peaks will be present in a mass spectrum for brcl?