rraOH

R 3 S. w

Titration Curves of a Strong and a Weak Acid with

a Strong Base.

Pig. 1.

Curves A n B

M.0.P.P.

0.1N.HC1 Acetic AcidMethyl Orange colour range Phenol Phthalein

#

x *

P.H

Practical V.

1 . Determine the amount of chloride chlorine in:-(a ) tap water, (b) sewg^^ef fluent A , (c) water B.

Express your result as^^ffts per 100,000 and also as grams

per gallon in terms of chlorine and of sodium chloride.

[Given 0.01W Silver Nitrate]

2. Test the waters C, D, E, and P for the presence of poisonous

metals.

D^ermlne the amount present in water C.

n 9 . 6

- x k 4 f t d - f W., \ G C

• f 1 / f a y . /t ,(?/

f gu, ^ > f 1

j&d ^ ^ j h > ' X t ~ <? ■ i ■ x / ^ u ~

^ T V w « 6 , . X / * ^ . g j - X l t V

i ^ n r ^ . o / * w

i V ^ - = W i f ^ ,!•, v/ U/r/, 'I a. « ''ft

** 1 Al — 3.*- X . * * * * ' "

* * ‘4 s . J '■

1 d#-r\X~ *2> -S* • I

/. Oi d/'H Cl * . 1 5 .( / r . ^ 7 ^, = *6 * <S~0>

, ( I <UL . (y r o i M < L ,i _ -> ' t . f 2

*3' S>*lf A 3t ( r v r n '

f f a 6 - & - 0 ~ * V ’’ 1 h a # * * - * * * • n

' 1 r ~ f S * ~ » . b S j

' ' '^Xt. (Wiiu*— y ,f C' n t& Pj U _____

2-53 i' J-

/ V fe i' — v' 5 / y ^ »

^ C L i r •

~ K - ^ i ^ •

' H ^ ' \ $ m + M h & J B m » i f u

r f 1 - ^ 4 ^ 5 ^

1. Estimate in water (A) the ammoniasal nitrogen by

(i) direct Nesslerisation (ii) the Wanklyn process

2. Test water (B) for the presence of free chlorine.

Carry out the following two tests for free chlorine:

Iwi drops of potassium iodide solution and a drop or* Iodine is liberated if free chlorine

is present and a blue colour is ebtained with the starch, ihls test is not specific.

of ^ O-tolidine solution in acetic acid 6re colour develoDsco a*ning **ee chlorine an intense yellowcolour develops,

: W v * I/"-- t % $ MAhi X

«■ f CL-fTtf

Wytt&Ai ~H?JF .. J '-S fs‘ r-J0 'll\ j£r' | £. t *0 \Z / / , " ■ ' 2<*> \

- > • > £ *6 f >/>O *6 // f • r ^ , /

$ 'O f Yf& c a tjr - , O 01 v l_. y j

; _ • V - - a ■c ^ x y ^ / i > ^

A, K- /f>wy

M ,

* 2.51) w» w '5 u-~ A v w w C A ' ^ £-'t) '••■

jv c\j0 C— I Q ‘U ' ^ HA-* N M j

Practical VII.

I

1. Test the sample of water (A) for nitrite,

qualitatively and quantitatively.

2* Test the tap water for the presence of nitrate

and if present determine the amount,

3. Estimate the "nitric nitrogen” in the sample of

sewage works effluent (B).

Zt- <L* , H V * ^

5 2 - S v - v -

s > .

3 5 , 1 0 \ J * J ^

V O ca. w Aj-,

I H y

* s- 0t< tjd

»

u )

•o C M \A*M{/*dv U

* d-l * rO W

- . « • / V i a v J t o

^ / d s < -r

/v7 ~ -

* S' W - r t $ ^

P. P. H ,

1. Determine the protein content of the wheat flour pr'ovided,

[Use about 0.5 gm. of the flour. Digest in a KjeldaJkl

flask with 20 cc. of concentrated H2S4 .]

2. Note the general character of the flour and satisfy

yourself that it contains "gluten". This "gluten"

b ,■ t soluble in alkali and in acetic acid. Test such

a solution for proteins hy means of such tests asr ■ L ' A2

II ill on's, the glyoxylic and the xanthoproteic.

Perform these test also on (1 ) phenol, (2 ) benzoic

acid, and (3) salicylic acid.

3. Examine the starches set out under the microscopes.

o . , ....

£ ■ t o ^ ^ ' 7

f ^ n €&--— ~T > ~ * X /. / ____

r f v „ , t r

- / * + 1

— I

^ •-*£ ' / 4 .

6- &** ****+4-

1, Identify the disinf ctants A and B. /> / * ^ v/

2. Estimate the strength of (a) the given sample of

bleaching powder, (b) the solution of chlorine.

Use two methods and compare your results. . ' V

»l fu . JU u .3* Determine the strength of the phenol solution C,

Express your results as a nermality and as grams

Collection Number: AD843

XUMA, A.B., Papers

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