Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 650 off


Tritium,T(an isotope of H) combines with F to form a weak acid TF, which ionizes to give  T+, Tritium is radioactive and is BETA-emitter. A freshly prepared solution of TF has pT (equivalent of pH) of 1.5 and freezes at -0.372 degree celcius . If 600 ml of freashly prepared solution were allowed to stand for 24.8 years, CALCULATE:

(a) The ionization constant of  TF.

(b) The number of beta - particles emitted

7 years ago


Answers : (2)



Tritium , symbol T or 3H, also known as Hydrogen-3 is a radioactive isotope of hydrogen. The nucleus of tritium (sometimes called a triton) contains one proton and two neutrons, whereas the nucleus of protium (the most abundant hydrogen isotope) contains one proton and no neutrons.

β decay (electron emission)

Beta decay

An unstable atomic nucleus with an excess of neutrons may undergo β decay, where a neutron is converted into a proton, an electron and an electron-type antineutrino (the antiparticle of the neutrino):

np + e + νe

While tritium has several different experimentally-determined values of its half-life, the NIST recommends 4,500±8 days (approximately 12.33 years).It decays into helium-3 by the reaction


31T  →  32He  e  νe


pH is defined as minus the decimal logarithm of the hydrogen ion activity in an aqueous solution. By virtue of its logarithmic nature, pH is a dimensionless quantity.

\mathrm{pH} = - \log_{10} a_ \mbox{H} = \log_{10} \frac{1}{a_ \mbox{H}}

where aH is the (dimensionless) activity of hydrogen ions.  

Ans 2:

pT = 1.5 , therefore [T+] = 10(-1.5) = 0.032 M

Half life for Tritium is 12.33 yrs, therfore aftr 24.8 yrs , its has had two half lives, hence its conc. .is c/4 = .032/4 = .008 M  .

Now calculate the no. of moles in 600 ml. hence one can calculate the no. of moles converted from initial conc and final conc.

 After this, we can see from the eq that fr one mole of Tritium decayed , one mole of Beta particle is emitted , hence we can find the no. of beta particles emitted by knowing the total moles converted.


7 years ago


An acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction known as dissociation in the context of acid-base reactions. The equilibrium can be written symbolically as:

HA is in equilibrium with A + H+,

where HA is a generic acid which dissociates by splitting into A, known as the conjugate base of the acid, and the hydrogen ion or proton, H+, which, in the case of aqueous solutions, exists as a solvated hydronium ion. In the example shown in the figure, HA represents acetic acid, and A the acetate ion. The chemical species HA, A and H+ are said to be in equilibrium when their concentrations do not change with the passing of time. The dissociation constant is usually written as a quotient of the equilibrium concentrations, denoted by [HA], [A] and [H+]:

K_a equals the equilibrium concentration of the deprotonated form A-, times the equilibrium concentration of H+, all divided by the equilibrium concentration of the acid AH. 
we have already calculated [T+], but we still need the conc of TF and F- , then only we can find Ka .
7 years ago

Post Your Answer

Other Related Questions on Physical Chemistry

Current 10 amp passed througj cuso4 for 32min 10 sec.if 896ml oxy liberated at stp calculate efficiency of cell
from faraday’s law, moles x valence factor = i*t/F moles = i*t/F*n = 10*1930/2*96485 = 0.100 approx. Moles given at STP = 0.896/22.4 = 0.04 efficiency = (0.1-0.04)/0.1 * 100 => 60%
Vikas TU 25 days ago
Nmm thanks buddy.a small mistake valency factor n=4.because 2h2o gives o2 + 4h^+ +4eso the moles=.05 nd the answer is 80%
Pulkit Khandelwal 25 days ago
i need sone tips to prepare for higher exams. like, we should prioritise theories or numericals? for example, i m currently preparing mole concept
Hii I can help you with some books if you need that. Study from these books and topics will easy to you. Reference Books for Engineering Entrance Exam Chemistry NCERT Chemistry text books of...
Sourabh Singh 2 months ago
@ NAVYA kindly mention you are preparing for engg or medical entraance exams , so, that i can help u suitably . if u are focusing more on medical entrances then u need to solve problem in...
Umakant biswal 2 months ago
WHAT IS ELECTRO CHEMISTRY........................................?
SAI SARDAR 3 months ago
@ sree the branch of chemistry that deals with the relations between electrical and chemical phenomena... it besically deals with the interconversion of electric current used in chemical...
Umakant biswal 3 months ago
Electrochemistry is the branch of chemistry which deals with electricity produced by chemical reaction and also how electricity can carry out chemical reactions. Hope you understand my...
Adarsh 3 months ago
When the speed of an electron increases, its specific charge
As per the theory of relativity, as the velocity of electron increases its mass also increases. As specific charge is inversely proportional to mass, as mass increases specific charge...
Amogh Dasture 2 months ago
@ mandeep we know that specific charges are e/m e/m is inversely proportional to the velocity of the electron ,, therefore as speed of the electron increases , the specific charges...
Umakant biswal 2 months ago
When the spped of an electron increases, its charge /mass ratio or specific charge decreases.................................................
Mudit 2 months ago
How is pressure inversly proprtion to volume in mole concept??
For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law , stating that the pressure and volume of a gas...
Umakant biswal 3 months ago
According to Boyle's law or Pressure-Volume Law which state that the volume of a given amount amount gas held at constant temperature varies inversely with the applied pressure when the...
somprasad 3 months ago
What is conjugation and how to find it in an compound and all other information related to conjugation? and What is conjugated compound?
Conjugation is the terms which has been defined to understand the concept of Resonance. That simply reveals the displacement of the pi-pi bonds from one location to another location, and...
Vikas TU one month ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,750 off

Get extra R 650 off

More Questions On Physical Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details