A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?

1. 👍 0
2. 👎 0
3. 👁 139
1. The problem doesn't establish that this is a mono, di, or triprotic base but I assume one(1) OH group and we shall call it B + HCl ==> BH^+ + Cl^-
How many moles HCl did we add to reach end point? That is M x L = ??
moles base = same as mole HCl added.
moles = grams/molar mass
You know moles and grams, solve for molar mass.

1. 👍 0
2. 👎 0
posted by DrBob222

## Similar Questions

1. ### Chemistry

A 0.18 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.13 M) was used to titrate the sample, and 16 mL was required to reach the endpoint. What is the formula weight of

asked by Taylor on April 24, 2016
2. ### Chemistry

A 16.48 g sample of potassium permanganate is dissolved in a 250.0 mL volumetric flask. A 125.1 mL sample of the potassium permanganate solution is added to 75.3 mL of 5.110 M hydrobromic acid in which 32.3 mL of ethanol has been

asked by Millie on December 15, 2010
3. ### AP CHEMISTRY

The molar mass of an unknown organic liquid (M~100) is determined by placing 5 mL of the liquid in a weighed 125-mL conical flask fitted with a piece of Al foil with a pin hole in it. The flask is heated in a boiling water bath

asked by Someone on April 1, 2013
4. ### chemistry

ensity of Unknown Liquid: Lacy obtained a dry empty flask with a stopper and placed it on an analytical balance. She found the mass to be 36.765 g. Lacy then completely filled the flask with distilled water and forced all the air

asked by Lexy on October 1, 2019
5. ### Chemistry

A 0.125-g sample of monoprotic acid of unknown molar mass is dissolved in water and titrated with 0.1003 M NaOH. The endpoint is reached after adding 20.77 mL of base. What is the molar mass of the unknown acid?

asked by coug on January 4, 2010
6. ### Chemistry

A 500 mL flask has a measured volume of 586.0 mL. A 0.608g sample of an unknown vapor occupies the flask at 373K at a pressure of 0.981atm. Assume the vapor behaves ideally. What is the molecular weight of the unknown vapor?

asked by Caroline on December 7, 2014
7. ### chemistry

3. After removing membranes from an eggshell, the shell is dried and its mass is recorded as 5.613 g. The egg is transferred to a 250 mL beaker and dissolved in 25 mL of 6 M HCL. After filtering, the solution containing the

asked by James on November 18, 2014
8. ### Chemistry

A student weights 1.700 g of succinic acid and dissolves it in water in a 250.0 mL volumetric flask. A 25.00 mL sample of this solution is withdrawn and placed in a 125 mL Erlenmeyer flask, to which 5 drops of the acid-base

asked by Mary on October 26, 2014
9. ### Chem

A flask of unknown volume was filled with air at a pressure of 389.0 kPa. The flask was attached to an evacuated flask of 32.0 L and the air was allowed to expand into the second flask. At equilibrium, the final pressure was 154.0

asked by Sarah Pick on May 8, 2014
10. ### chemistry

1. A sample weighing 1.30 mg was analyzed to determine the concentration of a certain compound (FW =292.16 g/mol) using UV/Visible spectrometry. First, the sample was dissolved in 5.00 mL volumetric flask. A 1.00 mL aliquot was

asked by Chris on October 2, 2014

More Similar Questions