Time (minutes)

Citric acid con. (g)

pH value

Time (minutes)

Citric acid con. (g)

pH value

5

Plain

5.3^a ± 0.14

10

Plain

5.4^a ± 0.07

0.1

2.8^b ± 0.01

0.1

2.9^b ± 0.03

0.2

2.7^c ± 0.05

0.2

2.6^cd ± 0.01

0.3

2.5^de ± .0.02

0.3

2.5^de ± 0.01

0.4

2.4^e ± 0.02

0.4

2.4^e ± 0.02

0.5

2.5^e ± 0.03

0.5

2.4^e ± 0.01