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2NaOH + H2SO4 -> 2H2O + Na2SO4. moles = concentration x volume. #moles NaOH = 2M x (25/1000)dm3 = 0.05 mol. The reaction equations shows the ratio of alkali to acid is 2:1. The number of moles of H2SO4...

A buffer solution is resistant to changes in pH upon the addition of relatively small amounts of acid or base. In this case, the equilibrium resisting changes to the pH is: H2CO3 <-> H+ + HCO3-.

First split the equation in half. write down the number of each element there is on either side and then see how many more of that atom you need. make sure that there is the same number of carbons oxygens...

NH3 has a bond angle of 107 degrees and is pyramidal this is because it has 3 bonded pairs and 1 lone pair. the lone pair repels more than the bonded pairs and this results in the bond angle being 107 deg...

Copper is a metal, it therefore has delocalised electrons, i.e. e- which have come away from the atom, which can move through the solid metal allowing it to conduct heat and electricity. Other properties ...