Question

1. Name the primary standard that is routinely used for standardization of an acid.

2. Name the primary standard that is routinely used for standardization of a base.

3. Will a precipitate form if 10.0 mL of 1.0 x 10^-6 M iron(II) chloride is added to 20.0 mL of 3.0 x 10^-4 M barium hydroxide? Your solution to this problem MUST include a calculation of Q.

Answer 1

nary standard (Na co fer used to standardise standardisation of acid us sodium carenate the H say, HNO Benzoic like And as exed kor, TBAH do sandardere bare nolutions ethanolic sodium ate Features of primary standard are- High Purity stability (low creactivity Low by groscopicity high equivalent weight Ready & cheap avai lesilety. Non Toxic Featy e BagoH) recall to ml 200L Back 1x10-6 M 3x10 tm. precipitate will and form TeCOHl Bacle Fe3+ Ba2+ + 304 t e kap = kape 2.60 10 39 4x10-9 ² Rut no. of moles - to x 100 = 108 moles 1000 [R3] 10-8 x loco 33.33 X10-8 M 30 ce no of moles a 3 x 10 x 10 = Two 0.03X 106 sa 3x10 lood 1010 M 26 0.06x104 & X 10-4 30 xlovo at no of moles 20 x 3x10 (lovo = o.orx10 -4. [Ba2+] - 0.06 I lovo 2x 10-4 son nog moles 2 x 0 0 x 10-9 2xoorx 10-4 oix 10 Tag 0.13 X 10 x tovo 4*10-4- S

& R (4] = 23:33 x 16 8x10 10 & of ACOH 2 (feat Jong 2 33.33 X108 x 4x10-t = 133.32 x 10-12 = 1.3 x 10-16 (a > kepp.) keep offeron) = 2.68109 supersaturated solutions sone concentration greater then equilibrium cene y reaction goes backward and precipitation occurs. o of salez (Ba 2+ ][ce] - 2x 10-4 x 10-10 2 2x10- Ksp of Race? 4X10-9 (kep > 0) عشيقر الملعنهمین in concentations less than en concentration م عالمه الله لهم Precipe tate does neat form