A buffer solution contains 0.100 mole of sodium fluoride and 0.130 mole of hydrogen fluoride in one liter of solution. Calculate: (a) the concentration of the fluoride ion after the addition of 0.02500 mole of HCl to this solution.
(b) the pH after the addition of 0.02500 mole of HCl to this solution.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

answer: mole of the gas

answer: mole of the gasexplanation: