to stidy the effect of concentration on the.rate of
thiosulpBhute and hydrochloric. aeid. reaction behvee sod
THFORY (2)
According to the lawofmass action, rate of a chenical reaction is directly proportional Rate Melau Coe
to the próduct of the molar coricentrations of the reactants. In other words, the rate of reaction
12reasea with the inçrease in the coricentration of thereactants. The effect of concentration of
rackmb)
Teactants on rate of a reaction can be studied easilyby thereaction between sodium thiosulphate
audbydrochlornc acid
L Na,s,0,26HC1- Ss) +2NaClaq) + S0,g) +H,O) |
The insoluble sulphur, formed during the reaction, gives a milky apngarance and makes
the solution opaque. Therefore, rate of reaction can be studied by measuriúg the time taken to
produce enqugh sulphur to make some mark invisible on a paper kept uFder the conical flaskin
which the reaction is carned out.
APPARATUS 3 )
10ml pipette, stop-walch, two burot0s and five 100 ml.conical flasks. diotilled walen
MATERIALS REQUIRED
02MNaS,0, solution and 1 MHGlsolution. dollledwal
PROCEDURE
1. Waslr the conicalflasks with water, and label them ns 1, 2, 3, 4 nnd 5 respectively.
2. With the help of a burottef add 10, 20, 30, 40 and 50 ml of 0.1M Na,S,0, solution to
the flasks 1,2, 3, 4 and 5 respectively.
3. Now ad 10, 30, 20 and 10 ml of distilled water to the ask 1, 2,3 and 4 respectively
so that volume of solution in each flask is 50 ml
4. Take 10 ml of.1M HCl in a test tube
5. Add 10 ml of hydrochloric acid taken in a test tube to the conical lask No. 1 contain-
ing 10 ml of 0.1M NaS,0, and 40 ml of distilled water and start the stop walch.
Shakethe ontents of the conical ffask and place it on the tile with n cross nark as
shownin Fig.
6. Go on observing from-top.to downwarda in the flask and note down the time from the
stop-watch when the cross mark just becomes invisible.
7. Repeat the experinent by adding 10 ml of IM HCI to flask 2, 3, 4 and 5. and record the
time taken in each case for the cross to become just invisible.
**.
Observe from here
Na,S,0, + HCI
Cross mak
Tile or paper
thiosulpBhute and hydrochloric. aeid. reaction behvee sod
THFORY (2)
According to the lawofmass action, rate of a chenical reaction is directly proportional Rate Melau Coe
to the próduct of the molar coricentrations of the reactants. In other words, the rate of reaction
12reasea with the inçrease in the coricentration of thereactants. The effect of concentration of
rackmb)
Teactants on rate of a reaction can be studied easilyby thereaction between sodium thiosulphate
audbydrochlornc acid
L Na,s,0,26HC1- Ss) +2NaClaq) + S0,g) +H,O) |
The insoluble sulphur, formed during the reaction, gives a milky apngarance and makes
the solution opaque. Therefore, rate of reaction can be studied by measuriúg the time taken to
produce enqugh sulphur to make some mark invisible on a paper kept uFder the conical flaskin
which the reaction is carned out.
APPARATUS 3 )
10ml pipette, stop-walch, two burot0s and five 100 ml.conical flasks. diotilled walen
MATERIALS REQUIRED
02MNaS,0, solution and 1 MHGlsolution. dollledwal
PROCEDURE
1. Waslr the conicalflasks with water, and label them ns 1, 2, 3, 4 nnd 5 respectively.
2. With the help of a burottef add 10, 20, 30, 40 and 50 ml of 0.1M Na,S,0, solution to
the flasks 1,2, 3, 4 and 5 respectively.
3. Now ad 10, 30, 20 and 10 ml of distilled water to the ask 1, 2,3 and 4 respectively
so that volume of solution in each flask is 50 ml
4. Take 10 ml of.1M HCl in a test tube
5. Add 10 ml of hydrochloric acid taken in a test tube to the conical lask No. 1 contain-
ing 10 ml of 0.1M NaS,0, and 40 ml of distilled water and start the stop walch.
Shakethe ontents of the conical ffask and place it on the tile with n cross nark as
shownin Fig.
6. Go on observing from-top.to downwarda in the flask and note down the time from the
stop-watch when the cross mark just becomes invisible.
7. Repeat the experinent by adding 10 ml of IM HCI to flask 2, 3, 4 and 5. and record the
time taken in each case for the cross to become just invisible.
**.
Observe from here
Na,S,0, + HCI
Cross mak
Tile or paper
