Ce PH are acidul salicilic, fenolul ?

salutare,



Ce PH are acidul salicilic, fenolul ?(daca ne raportam la o solutie cu apa cu pH neutru 7 )
acidul salicilic cristalin din farmacii este acid salicilic in forma pura ? sau este asociat/amestecat si cu alte susbtante si reprezinta defapt săruri sau esterilor acidului salicilic ?


Multumesc

Edited by July02, 01 November 2017 - 02:32.

Formula Name Alternative name 1 mM 10 mM 100 mM
C2H2O4 oxalic acid ethanedioic acid 3.00 2.09 1.31
C4H4O4 maleic acid toxilic acid 3.05 2.21 1.54
C4H6O8 dihydroxytartaric acid   3.04 2.20 1.54
C6H6O6 cis-aconitic acid   3.05 2.21 1.55
C4H4O5 oxaloacetic acid oxalacetic acid 3.05 2.29 1.68
C5H6O5 oxoglutaric acid ketoglutaric acid 3.09 2.36 1.77
C3H4O3 pyruvic acid acetylformic acid 3.11 2.38 1.79
C4H6O3 2-oxobutanoic acid alpha-ketobutyric acid 3.11 2.38 1.79
C6H6O6 trans-aconitic acid   3.14 2.48 1.92
C3H4O4 malonic acid propanedioic acid 3.17 2.50 1.94
C8H6O4 phthalic acid ortho-phthalic acid 3.20 2.55 2.00
C4H6O6 L-tartaric acid racemic acid 3.18 2.55 2.01
C7H6O4 gentisic acid “2,5-dihydroxybenzoic” 3.21 2.56 2.01
C7H6O3 salicylic acid 2-hydroxybenzoic acid 3.21 2.57 2.02
C4H4O4 fumaric acid allomaleic acid 3.19 2.57 2.03
C4H6O6 DL-tartaric acid racemic acid 3.19 2.58 2.03
C4H6O4 methylmalonic acid   3.23 2.60 2.05
C5H6O4 mesaconic acid dimethylfumaric acid 3.23 2.61 2.06
C4H6O6 meso-tartaric acid racemic acid 3.24 2.62 2.08
C6H8O7 citric acid   3.24 2.62 2.08
C2H2O3 glyoxilic acid oxoacetic acid 3.27 2.65 2.11
C6H8O7 isocitric acid   3.28 2.69 2.16
C4H6O5 malic acid   3.33 2.74 2.21
C8H8O3 mandelic acid phenylglycolic acid 3.34 2.75 2.22
C8H6O4 isophthalic acid meta-phthalic acid 3.33 2.76 2.24
C8H6O4 terephthalic acid para-phthalic acid 3.36 2.79 2.26
C3H6O4 glyceric acid   3.38 2.80 2.27
C4H6O3 acetoacetic acid diacetic acid 3.40 2.83 2.30
C4H8O3 hydroxybutanoic acid   3.43 2.86 2.33
CH2O2 formic acid methanoic acid 3.47 2.91 2.38
C2H4O3 glocolic acid hydroxyacetic acid 3.50 2.94 2.42
C5H6O4 itaconic acid methylenesuccinic acid 3.50 2.95 2.43
C3H6O3 lactic acid milk acid 3.51 2.96 2.44
C8H8O2 toluic acid ortho-toluic acid 3.53 2.98 2.46
C6H8O6 ascorbic acid vitamin C 3.59 3.04 2.53
C5H8O4 methylsuccinic acid   3.62 3.08 2.57
C7H6O2 benzoic acid   3.66 3.12 2.60
C4H6O4 succinic acid butanedioic acid 3.65 3.12 2.61
C3H4O2 acrylic acid propenoic acid 3.68 3.14 2.63
C8H8O2 m-toluic acid meta-toluic acid 3.69 3.15 2.64
C5H8O4 glutaric acid pentanedioic acid 3.70 3.17 2.66
C8H8O2 phenylacetic acid benzeneacetic acid 3.70 3.17 2.66
C8H8O2 p-toluic acid para-toluic acid 3.73 3.20 2.69
C8H8O4 homogentistic acid   3.74 3.21 2.70
C6H10O4 adipic acid hexanediodic acid 3.74 3.22 2.71
C7H6O5 gallic acid “3,4,5-trihydroxybenz.” 3.75 3.22 2.71
C9H8O2 cinnamic acid trans-cinnamic acid 3.76 3.23 2.72
C7H6O4 protocatechuic acid “3,4-dihydroxybenzoic” 3.78 3.25 2.74
C7H12O4 pimelic acid heptanedioic acid 3.77 3.25 2.74
C3H6O3 3-hydroxypropanoic hydracrylic acid 3.79 3.27 2.76
C8H14O4 suberic acid octanedioic acid 3.79 3.27 2.76
C4H6O2 crotonoic acid 3-butenoic acid 3.84 3.32 2.81
C2H4O2 acetic acid ethanoic acid 3.91 3.39 2.88
C5H10O2 isovaleric acid isopentanoic acid 3.92 3.40 2.89
C4H8O2 butanoic acid butyric acid 3.94 3.42 2.92
C5H10O2 valeric acid pentanoic acid 3.95 3.43 2.92
C4H8O2 isobutanoic acid isobutyric acid 3.96 3.44 2.93
C6H12O2 caproic acid hexanoic acid 3.95 3.43 2.93
C3H6O2 propanoic acid propionic acid 3.96 3.44 2.94
C7H12O2 cyclohexanecarboxylic   3.97 3.46 2.95
C8H16O2 octanoic acid caprylic acid 3.97 3.45 2.95
C9H18O2 nonanoic acid pelargonic acid 4.00 3.49 2.98
C5H10O2 pivalic acid dimethylpropanoic acid 4.04 3.52 3.02
C6H6O phenol carbolic acid 6.47 5.99 5.49

greu de cautat pe net, nu?

Edited by marcusdefeis, 01 November 2017 - 02:43.

Multumesc mult!

fenolul vad ca are PH intre (6,47 - 5.49)
eu am crezut ca fenolul e mai acid si are PH mai mic decat acidul salicilic (ca e mai puternic acid decat acidul salicilic)

acidul salicilic cristalin din farmacii pare sa fie f slab acid sa aibe o aciditate f mica, adica un PH mult mai mare, nicidecum nu pare sa aibe PH-ul din domeniul (3.21- 2.02)

Edited by July02, 01 November 2017 - 04:03.

sa masori pH-ul unui medicament, este oartecum greu ! ...
toate, dar absolut toate, medicamentele au o infima cantitate de su8bstanta activa ! ...
restul este efectul Placebo si bicarbonat de calciu (CaCO3) ...
asadar, un biet bolnav, bea fara sa stie in cativa ani de "tratament" cativa saci de var ! ...

Edited by realduc, 01 November 2017 - 07:26.

July02, on 01 noiembrie 2017 - 03:35, said:

in care farmacie ai gasit/ gasesti / se gaseste acid salicilic cristalin?

si eventual un pret / um ...
merci anticipat!

Edited by r_murphy, 01 November 2017 - 08:11.

r_murphy, on 01 noiembrie 2017 - 08:10, said:

am luat demult din cartier de la o firmulita mica nu mai stiu numele ei si cat era,dar asa cum a zis cel de mai sus salicilatul era mai mult var am impresia substanta activa ciuciu.

realduc, on 01 noiembrie 2017 - 07:25, said:

tocmai deasta incredere nici in brandul Laboromed nu mai am,am cumparat niste medicamente de la Laboromed demult care cred ca au mai mult celuloza si var prin ele....
(e ceva de genul Salata cu icre si nu e Salata din Icre.... sau Salam si cu carne nu Salam din carne... restul sunt substante de umplutura fosfati, carbonati , ameliatori, potentiatori de gust, coloranti, agenti de ingrosare..... )

Edited by July02, 02 November 2017 - 19:03.

realduc, on 01 noiembrie 2017 - 07:25, said:

Evident, scrie pe cutie cat.

De cele mai multe ori e imposibil sa faci un comprimat sau alte forme farmaceutice doar cu substanta activa, pe considerente de dozare, usurinta de manipulare si multe alte considerente.

P.S.daca e bicarbonat unde e 2-ul?

oaspetele, on 12 noiembrie 2017 - 08:48, said:

cred ca a vrut sa zica carbonat de calciu , altfel bicarbonat Ca(HCO3)2