water concentrations, acids and bases

Question 1

what is the measured Molarity ratio?

Answer 1

solute:solvent

Question 2

what is the equation to find the weight of a molecule?

Answer 2

N(number of moles)= mass(grams)/molecular weight (Da)

Question 3

Is a dative bond reversible?

Answer 3

Yes

Question 4

What would you call a concentration with high H+ (hydrogen ions)

Answer 4

Acidic

Question 5

What would you call a solution with high OH- (Hydroxide ions)

Answer 5

Basic

Question 6

What would you call a solution with equal H+ and OH- ions?

Answer 6

Neutral

Question 7

What is the formula to find pH?

Answer 7

pH= - log(H+)
E.g. -log 10 (10-7) = -(-7)=7pH

Question 8

Which way on the pH scale is more acidic?

Answer 8

A more acidic solution has a pH of 0-6.9

Question 9

What is the pH scale of an alkaline (basic) solutions?

Answer 9

7.1 - 14

Question 10

Is pH3 3 times more acidic than pH6 or 1000x? Why?

Answer 10

1000x because of the logarithmic scale (10x10x10)

Question 11

What is a buffer?

Answer 11

A substance that minimizes changes in the concentrations of H+ and OH- by accepting and releasing hyrodogen ion when hydroxide ions are in excess or depletion.

Question 12

What is the base equivalent of carbonic acid? H2CO3

Answer 12

Bicarbonate and a hydrogen ion
HCO3 + H+

Question 13

What is Avogadros number?

Answer 13

6.022 x 10(23)

Question 14

What is 6.022x 10(23) called?

Answer 14

Avogadros number

Question 15

What is Molarity?

Answer 15

A concentration of moles in a solution

Question 16

What is the formula for Molarity?

Answer 16

Concentration= number of moles/litres of solution
M= mol/L

Question 17

what is the molecular weight of glucose?
C6H12O6

Answer 17

Carbon=12
hydrogen=1
oxygen=16
(6x12)+(12x1)+(6x16)
=72+12+96
=180g/mol

Question 18

what is the molecular weight of sodium chloride?
NaCl

Answer 18

Sodium=23
Chlorine=35.5
(1x23)+(1x35.5)
=58.5 g/mol

Question 19

what defines a strong base or acid?

Answer 19

when the compounds dissociate completely in water and cannot be reversed

Question 20

example of a strong base

Answer 20

sodium hydroxide

Question 21

example of a strong acid

Answer 21

hydrochloric acid

Question 22

example of a weak base

Answer 22

ammonia

Question 23

what defines a weak base or acid?

Answer 23

when they are able to accept back or release hydrogen ions, so reverse the dissociation