ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Equivalence point determination in radiometric precipitation titration by activity measurement of the precipitant

J. Klas

Slovak Technical University, Bratislava

Abstract: A radiometric method for pptn. titrn. based on the theoretically derived titrn. curve was described. The titrn. curve expresses the activity of the ppt. as a function of the vol. of the titrn. in relation to the detn. of the equivalence point. The activity of the ppt. is: n = C_A{[(v/ v_E) + 1] - {[(v/v_E) - 1]²+ 4(K₈k²/[A]₀²)}1/2} = C_D{[(v/v0) + (v_E/v₀)] - {[(v/v₀) - (v_E/v₀)]² + 4(K₈k²/[D]₀²)}1/2}, where [A_]0 and [D]₀ are the initial concns. of the soln. to be titrated and the titrant, resp., v the vol. of reagent added, v₀ the total vol. of the soln. to be titrated, v_E the equiv. vol. [A]₀v₀[D]₀, k the correction factor, K8 the soly. coeff., n the activity of the ppt., and c the proportionality const. between the amt. and the activity of the ppt. The equivalence point can be detd. graphically or from the equation v_E = v n_k/n.

Full paper in Portable Document Format: 199a689.pdf (in Slovak)

Chemical Papers 19 (9) 689–694 (1965)