Chemsheets AS006 (Electron arrangement)

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Presentation transcript:

Chemsheets AS006 (Electron arrangement) 26/04/2019 www.CHEMSHEETS.co.uk GROUP 2 – SULFATES & HYDROXIDES © www.chemsheets.co.uk AS 1060 3-July-15

When an IONIC substance dissolves, the ions separate and mix in with the water: NaCl(s) NaCl(aq) © www.chemsheets.co.uk AS 1060 3-July-15

Mg(NO3)2(aq) H2SO4(aq) Mix solutions of two ionic compounds: © www.chemsheets.co.uk AS 1060 3-July-15

No reaction they may just mix! © www.chemsheets.co.uk AS 1060 3-July-15

Ba(NO3)2(aq) H2SO4(aq) Mix solutions of two ionic compounds: © www.chemsheets.co.uk AS 1060 3-July-15

Ba2+(aq) + SO42-(aq)  BaSO4(s) or a precipitate may form (if it gives a combination of ions that is insoluble) Ba2+(aq) + SO42-(aq)  BaSO4(s) © www.chemsheets.co.uk AS 1060 3-July-15

MgCl2(aq) NaOH(aq) © www.chemsheets.co.uk AS 1060 3-July-15

Mg2+(aq) + 2 OH–(aq)  Mg(OH)2 (s) © www.chemsheets.co.uk AS 1060 3-July-15

BaCl2(aq) NaOH(aq) © www.chemsheets.co.uk AS 1060 3-July-15

No reaction © www.chemsheets.co.uk AS 1060 3-July-15

Group 2 sulphates MgSO4 CaSO4 SrSO4 BaSO4 © www.chemsheets.co.uk AS 1060 3-July-15

Group 2 sulphates MgSO4 CaSO4 SrSO4 BaSO4 Soluble Slightly soluble Insoluble BaSO4 © www.chemsheets.co.uk AS 1060 3-July-15

Group 2 sulphates MgSO4 CaSO4 SrSO4 BaSO4 Soluble Slightly soluble Ca2+(aq) + SO42-(aq) → CaSO4(s) SrSO4 Insoluble Sr2+(aq) + SO42-(aq) → SrSO4(s) BaSO4 Ba2+(aq) + SO42-(aq) → BaSO4(s) © www.chemsheets.co.uk AS 1060 3-July-15

Group 2 hydroxides Mg(OH)2 Ca(OH)2 Sr(OH)2 Ba(OH)2 © www.chemsheets.co.uk AS 1060 3-July-15

Group 2 hydroxides Mg(OH)2 Ca(OH)2 Sr(OH)2 Ba(OH)2 Insoluble Slightly soluble Sr(OH)2 Soluble Ba(OH)2 Souble © www.chemsheets.co.uk AS 1060 3-July-15

Mg2+(aq) + 2 OH-(aq) → Mg(OH)2(s) Ca2+(aq) + 2 OH-(aq) → Ca(OH)2(s) Group 2 hydroxides Mg(OH)2 Insoluble Mg2+(aq) + 2 OH-(aq) → Mg(OH)2(s) Ca(OH)2 Slightly soluble Ca2+(aq) + 2 OH-(aq) → Ca(OH)2(s) Sr(OH)2 Soluble Ba(OH)2 Souble © www.chemsheets.co.uk AS 1060 3-July-15

 MgSO4 Mg(OH)2   CaSO4 Ca(OH)2 SrSO4 Sr(OH)2 BaSO4 Ba(OH)2 more soluble more soluble Remember - Opposite trends - Ca(OH)2 & CaSO4 sparingly soluble - BaSO4 insoluble © www.chemsheets.co.uk AS 1060 3-July-15

Barium meal BaSO4 © www.chemsheets.co.uk AS 1061 3-July-15

Milk of magnesia Mg(OH)2 © www.chemsheets.co.uk AS 1061 3-July-15

Slaked lime Ca(OH)2 © www.chemsheets.co.uk AS 1061 3-July-15