Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    22
    ReputationRep:
    Am I right in thinking that the group 2 oxide reacts with water to form an alkaline solution of metal and hydroxide ions. When the solution becomes saturated, the metal ions and hydroxide ions form a metal hydroxide.

    Is this right?

    Does the metal hydroxide then dissolve again?
    Offline

    2
    ReputationRep:
    Group two elements react with water to form a metal hydroxide and hydrogen gas. Since its a hydroxide, you are right in saying that its an alkaline solution. Group 2 hydroxides are more alkaline down the group and reactivity down the group with water also increases as the first ionisation energy decreases.

    A group 2 oxide would form water instead of hydrogen gas, and as for if it dissolves, I think it depends on is the metal hydroxide is a solid or aqeous as it could form a precipitate.
    • Thread Starter
    Offline

    22
    ReputationRep:
    (Original post by derpz)
    Group two elements react with water to form a metal hydroxide and hydrogen gas. Since its a hydroxide, you are right in saying that its an alkaline solution. Group 2 hydroxides are more alkaline down the group and reactivity down the group with water also increases as the first ionisation energy decreases.

    A group 2 oxide would form water instead of hydrogen gas, and as for if it dissolves, I think it depends on is the metal hydroxide is a solid or aqeous as it could form a precipitate.
    I really don't know. My textbook doesn't mention water forming with a group 2 oxide
    • Community Assistant
    • Study Helper
    Offline

    15
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by SGHD26716)
    I really don't know. My textbook doesn't mention water forming with a group 2 oxide
    Group 2 oxides form hydroxides when mixed with water. For CaO this process is known as 'slaking' and hence calcium hydroxide is referred to as slaked lime
    Offline

    2
    ReputationRep:
    (Original post by SGHD26716)
    I really don't know. My textbook doesn't mention water forming with a group 2 oxide
    I havent been taught about Group 2 oxides reacting with water, just Gorup 2 elements so I kind of just thought of that on the spot
    • Thread Starter
    Offline

    22
    ReputationRep:
    (Original post by derpz)
    I havent been taught about Group 2 oxides reacting with water, just Gorup 2 elements so I kind of just thought of that on the spot
    Don't worry. I think the simple answer is that a metal hydroxide forms
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.