ph,ions,electrolyte

Question 1

Each step “up” is

Answer 1

10x more basic or 10 x less acidic

Question 2

Each step “down” is

Answer 2

10x more acidic or 10 x less basic

Question 3

A solution with a pH of 2 is … than a solution with a pH of 3.

Answer 3

10x more acidic

Question 4

A lab technician needs a solution that is 1000 times more basic than solution with a pH of 8. Determine the pH of the solution that the lab technician needs.

Answer 4

11

Question 5

Place the substances listed below in increasing order of pH. ● Distilled water
● Soap
● Lemon Juice
● Rainwater

Answer 5

lemon juice(pH ˜ 2), rainwater(pH ˜ 5), distilled water(pH ˜ 7), soap (pH ˜ 10)

Question 6

how know if acid

Answer 6

h+ non metal

Question 7

how know if base

Answer 7

metal+OH

Question 8

how know if salt

Answer 8

metal+non metal (or polyatomic)

Question 9

neutralization reaction

Answer 9

acid+base=salt+water

Question 10

HCl+NaOH

Answer 10

H2O+NaCl

Question 11

what is an ion

Answer 11

When an atom loses or gains electrons, it becomes charged and is known as an ion. An ion may be positively charged (electrons lost)anion or negatively charged (electrons gained)cation

Question 12

ions of metals and non metals in periodic table

Answer 12

+1 +2 +3 -3 -2 -1

Question 13

describe the mechanism that allows aqueous solutions to conduct electricity

Answer 13

electrolytic dissolution of a solute, formation of mobile ions.

When an ionic substance dissolves in water, it dissociates into positive and negative ions. These ions are mobile and will move in solution towards electrodes. This movement of charged particles produces an electrical current.

Question 14

You find a container in your school lab with KCl crystals and based on its molecular formula, you conclude that it is a salt. You test for its electrical conductivity, and surprisingly find that it does not conduct electricity. How can this be explained? What process must occur in order for the salt sodium chloride to conduct electricity?

Answer 14

KCl must be dissolved in water in order for it to dissociate into its ions(K + , Cl - ) and then conduct electricity. NaCl must first be dissolved in water so that it can separate into its ions; sodium ions (Na + ) & chloride ions (Cl - ). The Na + ions can now travel to the negative electrode and the Cl – ions are free to travel to the positive electrode so the current is able to flow