# Chemistry

If 20.00 mL of 0.2019 M HCl requires 39.63 mL of a NaOH solution for complete neutralization, what is the concentration of the NaOH solutions? How many significant figures are justified in the answer?

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1. The equation is
HCl + NaOH ==> NaCl + H2O

mols HCl = M x L
Convert mols HCl to mols NaOH from the equation.
M(NaOH) = #mols/L.
You have mols and L, solve for M.
Post your work if you get stuck.

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2. .1019M NaOH 4 sig figs

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3. HCl + NaOH ==> NaCl + H2O

(Don't forget to convert mL to L)

.2019M HCl = mol/L
solve for mol
Answer mol HCL = .02L * .2019M

1-1 ratio based on equation: (Answer mol HCL/1) * (1 mol HCL/ 1 mol KHP) = Answer mol HCl

using molarity equation, mol/L = M
solve for M

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posted by Leslie
4. ** Correction**

HCl + NaOH ==> NaCl + H2O

(Don't forget to convert mL to L)
(Use M=(mol/L)

.2019M HCl = mol/L
solve for mol
Answer mol HCL = .02L * .2019M

1-1 ratio based on equation: (Answer mol HCL/1) * (1 mol NaOH/ 1 mol HCl) = Answer mol NaOH

using molarity equation, mol/L = M
solve for M

1. 👍 1
2. 👎 0
posted by Leslie

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