11. Explain what will be put in each beaker, including solution and size of agar cubes.
-Beaker 1:
-Beaker 2:
-Beaker 3:
-Beaker 4:
12. To save time you will do more than one trail of the experiment at the same time. The beakers numbered _______ are the trails and the beaker numbered _______ is the control.
(Fill in the blanks)
13. A timer tell you the number of minutes and seconds that have passed, but you must record the number of minutes in Table 2.
7min 15sec = ___________ min
(Fill in blank)
Method
Here,we can two either 2 sizes,such as 5 mm in 2 beakers and 20mm in 2 beakers.
so, beaker 1:dilute Hcl+5 mm agar cubes+phenol red
beaker 2:5 mm agar cubes+phenol red
beaker 3:dilute Hcl+20 mm agar cubes+phenol red
beaker 4:20 mm agar cubes+phenol red
12.beaker 1 and 3 are samples and 2 and 4 are controls.
13.7.15 min
8.dil Hcl is diffusing into agar blocks which converts the phenol red to yellow.
10.to minimise the errors,especially to find out the agar cubes have some sort of pH changes in them
7). The colour change in the agar occurs due to the phenolphtaline indicator, which appears yellow under acidic and pink under basic conditions. As the acidic vinegar diffuses through the agar, the colour change occurs to yellow.
11. Explain what will be put in each beaker, including solution and size of agar cubes....
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