A student is titrating 50ml of 2.5M HI with 1.23M NaOH. How many milliliters of base are added to reach the equivalence point?

101.6ml

Explanation:

Using the formula;

CaVa = CbVb

Where;

Ca = concentration of acid (M)

Cb = concentration of base (M)

Va = volume of acid (ml)

Vb = volume of base (ml)

Based on the information as follows:

Ca = 2.5M

Cb = 1.23M

Va = 50ml

Vb = ?

Using CaVa = CbVb

2.5 × 50 = 1.23 × Vb

125 = 1.23Vb

Vb = 125/1.23

Vb = 101.6ml

- 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