Question

Arrange the substances based on their relative acid strength.

C,H-04 strongest acid intermediate acid HC,H-04 weakest acid HCN not a Bronsted-Lowry acid HF

Answer 1

Different definations of Acid-Base Theory Axhenious Theosay : Acid donate ut in ageous soln, to produce 43otion. Ex: ce, I, 4₂504 pk. Base: donate ou in agrous solution, - Ex Naou, calon), ete. Limitation * Only applicable for ageous solution. * can't explain the acidic behaviour of BF3, Buzet and the basic character of Nu ₂ ₂0 ete. Bronsted-Loury Theory: Acid: proton donor. proton acceptor. Ex: Nuz, H2O, FI • Bore: Limitation * Acidic nature of BF3 is not explained. Lewis-acid base theory • Acid: ă pair acceptor Ex! BF3 * vacant orbitale must be present to accomodate election from the external source. Bax: é pale donore. Ex! NU3 , 420 * Must have non-bonding election peur.

HA 17+ A (Acid) If Mother molecules acidity T barretty kt ? bone Acidic strength of tus on nove compounds may be compared from their pH vahen. For pu= -log[ut] for Glution, س ارا زا stones For weak acids, Pn value depends on ka.

НА a ut nt & A initial; H initial; Ateri C-ca [ut] = From Ostwald dilution law -log (44)--log(ke.c)2 pu = √ [-logka - logo | pu= 1 [Pka- loge if ke nakue T, Prat o put , Acidict pka HE HEN دسال Pain kleiner 34 strongest acid 9.2 Weakest acid HCqHz Oq A yo 3:4 - Intermediate and pain bu f (Aspisin) Order of acidity: HEY HC a H₂04) HEN order of basicity: F< cauzoi < CN- of conjugate base order of acidity of Conjugate bare: F-> Cu2017 CN- Not a Bronsted Lowry acid

Honce the of correct order relative acidic strength: HE) Healt₂04) Hen)F) CqM707) en