Rozpuszcznie

"Silicatc^^ Si<°Me^Jy (s) + 2H ⁺ HCO,- (aq) 5=*

Silicate^^Si<^”l (s) + Me²⁺ (aq) + 2HC0,’ (aq) Silicate^ £>i<    (s) + 2HjO (1) «=*

Cat^;on deficient silicate (s) + Si(0H)₄(aq) + 20H’ (aq)

O oxyg«n • Silicon o aluminium

»

i

Solid k Solution

|iv)

Fig. 3.8 Weathering reactions at the surface of a feldspar: (i) Broken boods become protonated and ionic-honded Na ⁺ is exchanged with H^{+ r}rom solution;

(ii) Protonated lattice; (iii) Further exchange of Na* for H* causes complete protonation of the edge tetrahedron; (iv) Edge tetrahedron compietely removed to solution as H₄Si0₄.