Respuesta :
Answer:
Poly(ethenol), ie poly(vinyl liquor), PVA, has a rehashing vinyl liquor unit with a sub-atomic equation of [-CH2 CHOH-]n. Its atomic weight can go from 25000 to 300000, contingent upon its chain length, which influences its consistency.
Borax, ie sodium tetraborate decahydrate, Na2B4O7.10H2O, when broken down in water, hydrolyses to frame a boric corrosive borate particle arrangement with a pH of around nine.
B4O72–(aq) + H2O(l) → HB4O7–(aq) + OH–(aq)
B4O72–(aq) + 5H2O(l) + 2H+ (aq) → 4H3BO3 (aq)
B(OH)3 (aq) + H2O(l) → B(OH)4–(aq) + H+ (aq)
Explanation:
Borax is intriguing since it contains boron molecules with both tetrahedral and trigonal planar stereo chemistry. Boric corrosive's acridity is clarified by electron pair acknowledgment as opposed to proton gift, and it is in this manner a monoprotic corrosive, not triprotic true to form.
At the point when arrangements of poly(ethanol) and sodium tetraborate are blended, the borate particles, B(OH)4–(aq) respond with the hydroxyl gatherings (OH) of the poly(ethenol). Frail cross-connecting inside the polymer strikes produce a viscoelastic gel. The high dissolvability in water proposes that broad hydrogen holding exists.
