Chemistry, 26.10.2020 17:00 pinkyglitter3308

Calculate the pH of a solution prepared by mixing 0.0870 mol of chloroacetic acid plus 0.0280 mol of sodium chloroacetate in 1.00 L of water. First do the calculation by assuming that the concentrations of HA and A− equal their formal concentrations. The pKa of chloroacetic acid is 2.865.

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Answer from: aly3048

pH = 2.373

Explanation:

Step 1: Calculate the molar concentrations of the species present

[chloroacetic acid] = 0.0870 mol / 1.00 L = 0.0870 M

[sodium chloroacetate] = 0.0280 mol / 1.00 L = 0.0280 M

Sodium chloroacetate is a strong electrolyte, so the concentration of chloroacetate is 0.0280 M.

Step 2: Calculate the pH of the solution

We have a buffer system formed by a weak acid (chloroacetic acid) and its conjugate base (chloroacetate). We can calculate the pH of the solution using the Henderson-Hasselbach equation.

pH = pKa + log [chloroacetate]/[chloroacetic acid]

pH = 2.865 + log 0.0280 M/0.0870 M

pH = 2.373

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.

Answer from: Quest

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you

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Calculate the pH of a solution prepared by mixing 0.0870 mol of chloroacetic acid plus 0.0280 mol of...