Which are strong bases? check all that apply.

- hcl

- naoh

- nh3

- h3co3

- hno3

- koh

            NaOH and KOH

                   Acid and Bases are defined according to three different theories and concepts.

                      a) Arrhenius Concept

                       b) Lowry Bronsted Theory

                      c) Lewis Theory

According to Arrhenius Concept of Acid and Base, "Acid is any specie which when dissolved in water ionizes to produce H⁺ ions".

Example:

                                  H₂SO₄    →    2 H⁺  +  SO₄²⁻

                                  H₂SO₄    →    2 H⁺  +  SO₄²⁻

While, "Bases are those species which when dissolved in water produces Hydroxyl Ions (OH⁻)".

Example:

                                  NaOH    →  Na⁺  +  OH⁻

                                  KOH    →     K⁺  +  2 OH⁻

          Strong acids and strong bases are catogorized as those species which when dissolved in water completely dissociates into corresponding ions. Hence, NaOH and KOH completely dissociates in water.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.