CHEMISTRY Y12
The Acidic Environment
CLOZE PASSAGE No 3
Acids in our body and our food
Complete the following sentences using appropriate words or short phrases
a) / Acids are proton …………………….b) / When HCl is added to water the ionisation produces what 2 ions
c) / The IUPAC name for acetic acid
d) / 2-hydroxypropane-1,2,3-trcarboxylic acid is commonly called
e) / The pH scale begins at ………….. and ends at ………….
f) / Complete the following equation pH =
g) / How much more acidic is an acid pH 2 compared to pH 5
h) / An acid that completely dissociates is strong or weak?
i) / Equal concentrations of citric, acetic and Hydrochloric. Which will have the lowest pH
j) / Cloudy ammonia is acid, alkaline or neutral
k) / Before using a pH probe it must first be c……………………..
l) / Phenolphthalein in an alkali would be what colour
m) / A 0.1M acid has a pH of 2.5 Is the acid weak or strong
n) / Choose 2 words to describe 10M Acetic acid. Weak,Strong,Dilute,Concentrated
o) / When H2SO4 is added to water equilibrium lies to the L or R
p) / The [H+] of 0.2M sulfuric acid is
q) / Seawater has a pH of
r) / An acidic oxide commonly used as a food additive
s) / An acid found in the stings of ants and bees
t) / Lactic acid is commonly found in ………
u) / Vitamin C is a source of what acid
v) / What mass of citric acid is required to make up 200ml of a 0.1M solution
w) / Calculate the pH of 0.0035M HCl solution
x) / Calculate the pH of a 0.0035M H2SO4 solution
y) / Between readings, a pH probe should be washed with …………………………..
z) / What is the new concentration when 20ml of 10M HCl is made up to 500ml
(use eqn M1V1 = M2V2)