Διαφάνεια 1

Διαφάνεια 1

: (. - ) . : (. ). : O-H N-H. . + : O-H N-H.

. (<5).

(5-20). - -.

(>20) . , CN- , HO-, .. , .

(>20) O-H or N-H. ( +) ( )

Glycine It can dissolve both water and other organic solvents as it is having both hydrophobic and hydrophilic properties. Solubility in water 24.99 g/100 mL (25 C) Solubility soluble in pyridine sparingly soluble in ethanol insoluble in ether

Benzoic acid In the presence of water, though short of ionization, water can hydrogen bond to benzoic acid. Thus C6H5COOH + H2O ---> C6H5COO--H--OH2. Benzoic acid is an The primary reason benzoic acid dissolves only slightly in organic acid. I would cold water is that, even though the carboxylic acid group is expect it to be polar, the bulk of the benzoic acid molecule is non-polar soluble in weak (water is polar). It is only the carboxylic group that is polar. aqueous bases and

In addition, there are no internal stabilizing structures that likely in ether. favor carboxylate, -COO(-), over carboxylic acid, -COOH. Solubility in water 1.7 g/L (0 C) 2.7 g/L (18 C) 3.44 g/L (25 C) 5.51 g/L (40 C) 21.45 g/L (75 C) 56.31 g/L (100 C) Solubility

soluble in acetone, benzene, CCl4, CHCl3, alcohol, ethyl ether, hexane, phenyls, liquid ammonia, acetates Solubility of benzoic acid, etc? Match each compound below with its solubilty characteristics (If the first corresponds to B, and the next 2 to C, enter BCC) 1) benzoic acid 2) ethyl-4-aminobenzoate 3) Napthalene A. Soluble only in aqueous bases B. Soluble in ether and aqueous acids (eg HCl) C. Soluble in ether, largely insoluble in aqueous solvents D. Soluble only in aqueous acids E. Soluble in ether and weak aqueous bases (eq NaHCO3)

Benzoic acid is an organic acid. I would expect it to be soluble in weak aqueous bases and likely in ether. - E ethyl 4 aminobenzoate is an organic base. I would expect it to be soluble in ether and in aqueous acids. - B Naphthalene is a neutral organic compound and I would expect it to be soluble in ether and not in aqueous solvents - C Isopropyl alcohol Solubility in water miscible

Solubility miscible in benzene, chloroform, ethanol, ether, glycerin soluble in acetone insoluble in salt solutions Ethyl acetate ester formula solubility (g per 100

g of water) ethyl methanoate HCOOCH2CH3 10.5 ethyl ethanoate CH3COOCH2CH3 8.7

ethyl propanoate CH3CH2COOCH2CH3 1.7 Solubility in water 8.3 g/100 mL (20 C) Solubility inethanol, acetone, diethyl ether, benzene

Miscible Fructose Soluble in water, ethanol and methanol. Sucrose sucrose is made up of two simple sugar units Glucose and Fructose and have so many 'OH' groups which show polarity, the polar water molecules breakup sucrose into glucose and fructose, this breaking involves the addition of one water molecule, C 12H22O11 + H2O = C6H12O6(Glucose) + C6H12O6(Fructose) , ether (diethyl ether) is a non polar solvent and can not break the fructose molecules so fructose is insoluble in ether.

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