#### Answer

1.4 M
2.61M

#### Work Step by Step

Identify the knowns and unknowns in the problem. We know the M and vol of the acid, the vol of the base, but not the M.
Write a balanced neutralization reaction so you can determine the mol ratios.
Convert from Liters of Hcl to mols of NaOH using conversion factors. We know the molarity of HCl with gives us the first conversion factor. The mol ratios from the balanced chemical equation gives us the second conversion factor.
To calculate the molarity of NaOH divide the moles of NaOH (you just calculated) by the Liters of the NaOH solution.
Identify the knowns and unknowns in the problem. We know the M and vol of the acid, the vol of the base, but not the M.
Write a balanced neutralization reaction so you can determine the mol ratios.
Convert from Liters of Hcl to mols of NaOH using conversion factors. We know the molarity of HCl with gives us the first conversion factor. The mol ratios from the balanced chemical equation gives us the second conversion factor.
To calculate the molarity of NaOH divide the moles of NaOH (you just calculated) by the Liters of the NaOH solution.