5. A sample of Zn(OH), is placed in 100 mL of water at 25°C. The sample is filtered and 99.2 mL of solution is recovered. This solution is evaporated and yields 1.63 x 10 g of solid. What is the K of Zn(OH),? What was the pH of the original saturated Zn(OH), solution? SD

1. Calculate the pH of the resulting solution when 1 mL of 50 mM HCI is added to 250 mL of (a) pure water (b) a 0.001 M solution of sodium acetate, and (c) a 0.01 M solution of sodium acetate.

2. In the second titration, the molar mass of an unknown monoprotic acid is calculated.  If 0.100 grams of unknown solid are dissolved in water and titrated with 4.68 mL of the NaOH, what is the molar mass of the solid? HINTS: Molar mass is grams / moles. We have grams from the weighed mass, we can calculate moles of acid from the titration. Monoprotic means that it produces 1 H+ per molecule. This means that our moles of NaOH added and moles of acid are the same. You will need to use your concentration of NaOH from the previous question Which is 0.1186

help on chem worksheet please. topic is about titration and buffers

A 20.00-mL sample contains 1.00 g of NAHCO,. This sample is used to standardize an NaOH solution. At the equivalence point, 39.60 mL of NaÓH have been added. K,(HCO, ) = 4.8 x 10 Indicators that change color within the pH range: bromothymol blue = 6.0 – 7.7 phenolphthalein = 8.3 – 9.8 alizarin yellow R = 10.0 – 12.0 a. What was the concentration of the NaOH? Concentration M b. What is the pH at the equivalence point? pH = c. Which indicator, bromothymol blue, phenolphthalein, or alizarin yellow R, should be used in the titration? bromothymol blue phenolphthalein allzarin yellow R y Another Version 10 item attempts remaining

Sodium benzoato , NaC7H5O2, is used as a preservative in foods . Consider a 50.0mL sample of 0.250 M NaC7H5O2 being tittated by 0.200M HBr . A) what is the pH after the addition of 50.0mL of the HBr solution  B) what is the pH at the equivalence point  C) what is the pH after the addition of 75.0mL of the HBr solution?  Thank you for the help ! I have no clue how to even start .

Please don't provide hand written solution.....

An analytical chemist is titrating 147.3 mL of a 0.3200M solution of ammonia (NH,) with a 0.8200M solution of HNO,. The p K, of ammonia is 4.74. Calculate the pH of the base solution after the chemist has added 64.7 mL of the HNO, solution to it. Note for advanced students: you may assume the final volume equals the initial volume the solution plus the volume of HNO, solution added. Round your answer to 2 decimal places.

Calculate the pH of 1.0 L of the solution upon addition of 0.010 mol of solidNaOH to the original buffer solution.

For an aqueous solution formed by mixing 4.50mL of 0.15M LIOH with 25.0mL of 0.100M C2H5CO2H (propanoic acid), a) determine whether this forms a buffer solution. b) determine the pH of this combined solution. c) state whether the addition of 6.75mL of 0.100M HCl to the solution will have a large or small effect on the pH of the solution. Explain your reasoning (using 1-2 sentences).