From the experimental results, summarized as follows:
1. when the orange juice mixed with lemon juice pH value will be equal to 4.0.
2. lemon juice mixed with pineapple juice pH value will be equal to 3.0.
3. when water is mixed with pineapple juice to the equation is equal to the value of pH 4.5.
Show that when mixed with water, lemon juice, pineapple juice, will find that a acid higher. Lemon juice mixed with orange juice and orange juice mixed with pineapple juice. We also found that when the juice obtained from the combination of such kinds all and salt dissolving in water, and bring the coins with dirt fill time about 30 minutes later, 30 minutes, bring the coin came out clear, clean water, found that the coins in the water mixed with the highest pH values Mimi cleanliness. because the acid concentration is coupled with the most corrosive, respectively, the concentration of the a