The flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.290 M NaOH. It requires 13.2 mL of the NaOH solution to reach the end point of the titration. A buret filled with a titrant is held above a graduated cylinder containing an analyte solution. What is the initial concentration of HCl

0.383M

Explanation:

The following data were obtained from the question:

Volume of acid, HCl (Va) = 10mL

Molarity of acid, HCl (Ma) =...?

Molarity of base, NaOH (Mb) = 0.290 M

Volume of base, NaOH (Vb) = 13.2mL

Next, we shall write the balanced equation for the reaction. This is given below:

HCl + NaOH —> NaCl + H2O

From the balanced equation above,

The mole ratio of the acid (nA) = 1

The mole ratio of the base (nB) = 1

Finally, we shall determine the concentration of the acid, HCl solution as follow:

MaVa/MbVb = nA/nB

Ma x 10 / 0.29 x 13.2 = 1

Cross multiply

Ma x 10 = 0.29 x 13.2 x 1

Divide both side by 10

Ma = (0.29 x 13.2 x 1) /10

Ma = 0.383M

Therefore, the concentration of the acid, HCl is 0.383M.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

i believe the answer is three water molecules