Calculate the ph of a solution resulting from the titration of 30.00 ml of 0.055 m hno3 with 40.00 ml of 0.026 m naoh

n(HNO3) =0.055 mol/L * 0.03000 L = 0.00165 mol HNO3

n(NaOH) = 0.026 mol/L * 0.04000 = 0.00104 mol NaOH

NaOH + HNO3 > NaNO3 + H2O

from equation 1 mol(NaOH) 1 mol(HNO3)

given 0.00104 mol (NaOH) 0.00165 mol(HNO3)

HNO3 is leftover 0.00165 - 0.00104 = 0.00061 mol HNO3

Volume of the solution is 30.00 + 40.00 = 70.00 ml = 0.07000 L

Concentration of HNO3 = 0.00061 mol HNO3/0.07000 L solution = 0.0087 mol/L

Concentration of H⁺ = 0.0087 mol/L, also because HNO3 ---> H⁺ + NO3⁻.

pH = - log{H⁺] = - log[0.0087] ≈ 2.06 ≈2.1

pH ≈ 2.1

- 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

c (diamond),

sio2 (quartz)