A 30 ml sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration is 0.0300 M give some possible identities for the unknown base

HNO3 + xBOH ==> xH2O + B(NO3)x

millimols HNO3 = 12 mL x 0.150M = 1.8
millimols base = 30 x 0.03 = 0.9. The titration step shows us that we take twice as much HNO3 as the base; therefore, the base must contain two OH groups; therefore, I would look at Mg(OH)2, Ba(OH)2, Sr(OH)2, as the unknown base. Proof:
2HNO3 + Mg(OH)2 ==> 2H2O + Mg(NO3)2
millimols HNO3 = 12 x 0.150 = 1.8
millimols Mg(OH)2 = 30 x 0.03 = 0.9
Convert mols Mg(OH)2 to mols HNO3 as
0.9 mmols Mg(OH)2 x (2 mol HNO3/1 mol Mg(OH)2) = 0.9 x 2/1 = 1.8 which is what we took of HNO3.

To find possible identities for the unknown strong base, we need to use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction.

First, let's write the balanced chemical equation for the neutralization of a strong base with HNO3:

Base (OH-) + Acid (HNO3) → Water (H2O) + Salt

Since the unknown base concentration is given as 0.0300 M and we know that 30 mL of the unknown base solution neutralizes 12 mL of 0.150 M HNO3 solution, we can calculate the number of moles of each compound involved.

Number of moles of HNO3 = (volume in L) x (concentration in M)
Number of moles of HNO3 = (12 mL / 1000 mL/L) x (0.150 M)
Number of moles of HNO3 = 0.0018 moles

From the balanced chemical equation, we can see that 1 mole of HNO3 reacts with 1 mole of base. Therefore, the number of moles of the unknown base used in the reaction is also 0.0018 moles.

Knowing the number of moles of the unknown base and its concentration (0.0300 M), we can calculate its volume using the formula:

Volume in L = (number of moles) / (concentration in M)
Volume in L = (0.0018 moles) / (0.0300 M)
Volume in L = 0.06 L

Since the volume of the unknown base used in the neutralization reaction is 0.06 L (or 60 mL), we can consider the following strong base candidates with a concentration of 0.0300 M:

- Sodium Hydroxide (NaOH)
- Potassium Hydroxide (KOH)
- Lithium Hydroxide (LiOH)
- Calcium Hydroxide (Ca(OH)2)
- Barium Hydroxide (Ba(OH)2)

These are just a few possible identities for the unknown base. It would require additional information or experimental data to determine the exact identity of the unknown strong base.