A sample of THAM primary standard base weighed 0.9180 grams. After dissolving in 100ml deionized water...

A sample of THAM primary standard base weighed 0.9180 grams. After dissolving in 100ml deionized water and adding four drops of brom-cresol-green indicator, an HCl solution was added gradually until a definite color change was observed. At this point, 28.20 ml of HCL solution had been drained from the buret. Using the equation for the overall reaction, calculate the molarity of the HCl

Expert Solution

THAM base molar mass = 121.14 g/mol

THAM base moles = mass / molar mass

= 0.9810 / 121.14

= 0.00809

HCl moles = THAM base moles

= 0.00809

volume of HCl = 28.20 ml = 0.0282

molarity of HCl = moles / volume

= 0.00809 / 0.0282

= 0.287 M

molarity of HCl =0.287 M

queen_honey_blossom answered 1 year ago

a solution if phosphoric acid was made by dissolving 10g of H3PO4 in 100mL of water....

a solution if phosphoric acid was made by dissolving 10g of H3PO4 in 100mL of water. the resulting volume was 104mL. calculate the density, mole fraction, molarity, and molality of the solution. assume water has a density of 1g/cm3

A solution was prepared by dissolving 0.0258 mol disodium phosphate in 500.0mL of deionized water. Phosphoric...

A solution was prepared by dissolving 0.0258 mol disodium phosphate in 500.0mL of deionized water. Phosphoric acid has the following pKa values: pKa1 = 2.148 , pKa2 = 7.198 , pKa3 = 12.375. a) What was the pH of the resulting solution? b) What was the concentration of H2PO4- in the solution?

How many grams of Tris base (Trizma base) and sodium chloride are weighed out to make...

How many grams of Tris base (Trizma base) and sodium chloride are weighed out to make one liter of 10x Tris-buffered saline, pH 7.4 (TBS) which contains 100mM Tris base and 1.5 M NaCl?

After dissolving in 50.0 mL of good water, the zinc in a 0.422 g sample of...

After dissolving in 50.0 mL of good water, the zinc in a 0.422 g sample of foot powder was titrated at a pH=12.0 with 26.67 mL of a 0.01222 M EDTA solution. Calculate the % Zn in this sample and the ppm of Zn in the original foot powder sample.

Given the following solubilities in grams/100ml of water (these are the amounts that stay in solution...

Given the following solubilities in grams/100ml of water (these are the amounts that stay in solution at these temperatures): caffeine 1.35g (16 degrees Celcius) 45.5g (65 degrees celcius) NaCl 35.7g (0 degree celcius) 39.1g (100 degrees celcius) Suppose that 20g of a mixture that is 75% caffeine and 25% NaCl is crystallized from 100mL of boiling water and cooled to 16 degrees celcius. a) how much of the caffeine from this mixture stays in solution at 16 degrees celcius? b)...

You prepare a Mg2+ standard solution by dissolving 0.101 g of solid MgSO4x7H2O in a 100mL...

You prepare a Mg2+ standard solution by dissolving 0.101 g of solid MgSO4x7H2O in a 100mL volumetric flask and then performing a dilution of this solution into a 50 mL volumetric flask so that the dilute stock solution is one-fifth the concentration of the concentrated stock solution. Finally, you can dilute this second “dilute” stock solution into 100 mL volumetric flasks to achieve the desired standard concentrations. 1. What will be the concentration of Mg2+ ions, in both molarity and...

A solution is prepared by dissolving MgCl2 (1.3 g/L) and NH4Cl (20.0 mg/L) into deionized water....

A solution is prepared by dissolving MgCl2 (1.3 g/L) and NH4Cl (20.0 mg/L) into deionized water. The pH of the solution is adjusted to 8.85 using NaOH. What is the concentration of ammonia, NH3(aq), in this solution? The pKa of NH4+ is 9.24.

a solution is prepared by dissolving 26.6 grams of glucose in 0.949 kilogramos of water. the...

a solution is prepared by dissolving 26.6 grams of glucose in 0.949 kilogramos of water. the final volume of the solution is 738 mililiters. calculate mole fraction

A random sample of 80 baby boys, show they weighed 3000 grams on average with a...

A random sample of 80 baby boys, show they weighed 3000 grams on average with a standard deviation of 100, at birth. While a random sample of 60 baby girls show they weighed 2800 grams on average with a standard deviation of 70. In order to test the hypothesis that if baby boys and girls weights have the same variance or not, what is the value of test statistic? A) 2.041 B) 0.490 C) 0.7 D) 1.429

Explain why the pH of deionized water changes so drastically when acid or base is added.

Question