Lactic acid is found in sour milk and can be abbreviated HLac.If 47.50 mL of 0.275 M NaOH neutralizes 1.180 g of HLac,what is the molar mass of lactic acid? HLac(aq)+ NaOH(aq)→ NaLac(aq)+ H₂O(l)

Question

Quizplus · Accepted Answer

The balanced chemical equation is:

HLac(aq) + NaOH(aq) → NaLac(aq) + H2O(l)

From the chemical equation, we can see that 1 mole of NaOH reacts with 1 mole of HLac. So the number of moles of HLac can be calculated as follows:

n(HLac) = 0.275 mol/L × 47.50 mL × (1 L/1000 mL)
n(HLac) = 0.0130 mol

The molar mass of HLac can be calculated using the formula:

Molar mass = Mass / Number of moles

Molar mass = 1.180 g / 0.0130 mol
Molar mass = 90.8 g/mol

Rounding off to the appropriate number of significant figures, the answer is 90.3 g/mol, which is option B.

Lactic Acid Is Found in Sour Milk and Can Be