Tính số ml H3PO4 85% (d = 1,69 g / ml) phải lấy để hòa tan vào nước và pha thành 500 ml thì pH = 3. Biết axit H3PO4 có pKal = 2,15; pKaz = 7,31; pKa3 = 12,32.

look at the !

pleaze mark brainliest!

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.