DISCUSSION In the test using 0.1 M HCl and 1.0 M HCl, the result was that 0.1M HCl has a lighter pink and green colour compared to 1.0 M HCl when tested with Universal indicator and Methyl violet respectively. This is because 0.1M HCl has lower concentration of hydrogen ions than 1.0M HCl. This will cause the reaction to be lesser, making the intensity of colour to be lesser as well. While the pH reading, 0.1 M HCl has a higher reading than 1.0 M HCl, which shows the 1.0M HCl is more acidic than 0.1M HCl. The next test was using 0.1 CH 3 COOH, since we not provided with 1.0M CH 3 COOH, not much comparing can be done. But theoretically, the 1.0M CH 3 COOH should be having a darker colour change compared to 0.1M CH 3 COOH for both methyl violet and methyl orange. Same goes to the pH meter reading, the reading should be lower for 1.0M CH 3 COOH showing that it is more acidic than 0.1M CH 3 COOH. Again, we were not provided with 1.M NaOH. So the results for this part for 0.1M NaOH when tested with alizarin yellow is red in colour which is right since NaOH is a strong base. For the 0.1M NH3, it has a yellow colour when tested with alizarin yellow. This sums up that the stronger the base, the darker the colour intensity. For the determination of pH of salt solutions, NaCl has a pH paper reading of 7.0 indicating it is a neutral salt while NaOAc has a reading of 9.0 indicating it’s a basic salt. Lastly, NH 4 NO 3 has a pH reading of 6.0 indicating it’s an acidic salt.
In the test using 0.1 M HCl and 1.0 M HCl, the result was that
0.1M HCl has a lighter pink and green colour compared to 1.0 M HCl
when tested with Universal indicator and Methyl violet
respectively. This is because 0.1M HCl has lower concentration of
hydrogen ions than 1.0M HCl. This will cause the reaction to be
lesser, making the intensity of colour to be lesser as well. While
the pH reading, 0.1 M HCl has a higher reading than 1.0 M HCl,
which shows the 1.0M HCl is more acidic than 0.1M HCl. The next
test was using 0.1 CH3COOH, since we not provided with 1.0M
CH3COOH, not much comparing can be done. But theoretically, the
1.0M CH3COOH should be having a darker colour change compared to
0.1M CH3COOH for both methyl violet and methyl orange. Same goes to
the pH meter reading, the reading should be lower for 1.0M CH3COOH
showing that it is more acidic than 0.1M CH3COOH. Again, we were
not provided with 1.M NaOH. So the results for this part for 0.1M
NaOH when tested with alizarin yellow is red in colour which is
right since NaOH is a strong base. For the 0.1M NH3, it has a
yellow colour when tested with alizarin yellow. This sums up that
the stronger the base, the darker the colour intensity. For the
determination of pH of salt solutions, NaCl has a pH paper reading
of 7.0 indicating it is a neutral salt while NaOAc has a reading of
9.0 indicating its a basic salt. Lastly, NH4NO3 has a pH reading of
6.0 indicating its an acidic salt.
