Chemistry, 15.12.2019 02:31, aweller3898

According to the arrhenius model of acids and bases, what happens when an acid is added to water?
the acid increases the concentration of hydroxide ions.
the acid increases the concentration of water molecules.
the acid increases the concentration of salt ions.
the acid increases the concentration of hydrogen ions.

Answers: 3

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answered: braisly6605

The acid increases the concentration of hydrogen ions.

Explanation:

Arrhenius Base:

According to Arrhenius a base is substance that increase the concentration of hydroxyl ion in aqueous solution. In other words we can say that it increases the OH⁻ when dissociate into water.

Arrhenius acid:

According to Arrhenius an acid is substance that increase the concentration of hydrogen ion in aqueous solution. In other words we can say that it increases the H₃O⁺ when dissociate into water.

The hydrogen ion can not exist in free form so it react with water molecule and form hydronium ion.

HCl + H₂O → H₃O⁺+ Cl⁻

HCl is Arrhenius acid and donate proton.

Water accept that proton.

answered: Guest

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.