group 2 solubility Flashcards
what is the general equation for when a group 2 metal reacts with water
include state symbols
word equation as well
X(s)+2H2O(l)—->X(OH)2(aq)+H2(g)
metal+water—-> metal hydroxide +hydrogen
how do you write the oxidation state for a group 2 metal
X2+ + 2e-
what happens when Mg reacts with colder water
it reacts slowly
what do we react Mg with instead of cold water to increase the rate of reaction
STEAM SO WATER IN GASEOUS STATE
write the word equation including state symbols for the reaction of Magnesium with steam
Mg(s)+H2O(g)——>MgO(aq)+H2(g)
what is reactivity
a measure of the tendency of an atom to lose or gain electrons
describe the trend in reactivity of group 2 metals
reactivity increases down the group
describe the reactivity of group 2 metals down the group
Be-doesn’t react
Mg-reacts slowly
Ca-reacts steadily
Sr-reacts quickly
Ba-rapidly
describe the trend in solubility down group 2 when they are hydroxides
solubility increases down group 2 for when they are hydroxides
Describe the solubility, and precipitate formed for
Mg(OH)2 to Ba(OH)2
Mg(OH)2 insoluble and white precipitate
Ca slightly soluble and white precipitate
Sr(OH)2 soluble and colourless solution
Ba(OH)2 soluble and colourless solution
write the ionic equation with state symbols for when Mg2+ reacts with OH-
can this be applied to all the elements in group 2
Mg2(aq) + +2OH-(aq) –>Mg(OH)2
yes it can we just replace Mg with the elements symbol
write the ionic equation for when Mg reacts with SO42- ion
Mg2+ + SO42- —> MgSO4
explain the trend in solubility down group 2 for their sulfate counterparts
solubility decreases down group 2 for their sulfates
how to test for sulfates (3)
-Add HCL to remove any carbonate ions
-Add BaCl
-the result=white precipitate
why do we add HCL to test for sulfates
to remove any carbonate ions as we do not want them forming a precipitate.
