Which combination can be used to make a buffer with a pH of 4.2? The Ka of benzoic acld, the Ka of hydrocyanic acid, HCN, is 4.9x10-10. Item equation/constant: A pH=pK. +log | HA Select one: O a. 50.0 mL of 0.500 M HCN and 50.0 mL of 0.500 M sodium hydroxide. O b. 50.0 mL of 0.500 M C6H;COOH and 25.0 mL of 0.500M sodium hydroxide. O c. 50.0 mL of 0.500 M OC&H5COOH and 50.0 mL of 0.500 M sodium hydroxide. O d. 50.0 mL of 0.500 M HCN and 25.0 mL of 0.500 M sodium hydroxide.

Q: Determine the mass of solid NaCH.COO that must be dissolved in an existing 500.0 mL solution of…

A: Given data, Molarity of CH3COOH = 0.200M Volume of CH3COOH = 500.0mL = 0.500L pH = 5.00 Ka for…

Q: 140 Assume that 30.0 mL of a 0.10 M solution of a weak base B that accepts one proton is titrated…

A: (a) The molarity of weak base B and strong acid HA is 0.10 M. The volume of weak base used is 30.0…

Q: pH Measurement and Buffer Q1.Substances    pH value at 25°C     [H+] (mol dm-3)   vinegar…

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: Determine the ph at the equivalence point in the titration of 50.0 ml of 0.300M CH3C00H with 0.300M…

A: Given  molarity of CH3COOH = 0.300 M molarity of NaOH = 0.300 M volume = 50.0 ml  Calculate moles…

Q: Calculate the pH for each case in the titration of 50.0 ml. of 0.100 M HCIO(aq) with 0.100 M…

A: Answer: In this question we have to find out the pH of following four types of solutions at…

Q: titrates a 35.00 mL sample of 0.0100 M sodium hypochlorite (NaClO), a salt containing the conjugate…

A: According to the question, sodium hypochlorite reacts with HCl to produce NaCl and HClO.  The…

Q: The next 9 questions are related to the titration of 40.00 mL of a 0.0900 M acetic acid solution…

A: The dissociation reaction of acetic acid is written below. CH3COOH ⇌ CH3COO- + H+ The ICE table is…

Q: Consider the titration of a 30.0 mL sample of 0.150 M CH3COOH (Ka=1.8×10−5) with 0.200 M NaOH.…

A:

Q: . calculate the pH of the solution when an additional 5.0 mL of potassium hydroxide has been added;…

A: The question is based on the concept of titrations. we are titrating a weak acid with a strong base.…

Q: Calculate the pH of a buffer that is 0.020 M in NH3 and 0.030 M in NH4Cl. What is the pH after…

A: The solution generated by adding base (weak) in its salt is recognized as "basic-buffer". It possess…

Q: I would like for the equivalence points to fall at between 20mL and 40mL.  Therefore a rough trial…

A: Given : Mass of acid used = 0.2190 g Volume of NaOH required to reach second equivalence point =…

Q: For the best system, calculate the ratio of the masses of the buffer components required to make the…

A: • For best buffer, moles of KClO and moles of HClO  should be the same. • Let moles of HClO an moles…

Q: A student titrates an unknown weak acid, HA, to a pale pink phenolphthalein endpoint with 25.0 mL of…

A: •first acid and base react completely to form salt NaA. • Then NaA react with HCl to form HA and…

Q: You are given 90 mL of 0.6 M of the weak base NH3 (Kb = 1.8 × 10^-5), and 1 M of the strong acid…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: The next 9 questions are related to the titration of 40.00 mL of a 0.0900 M acetic acid solution…

A: At the equivalence point, the number of moles of acid is equal to the number of moles of base. The…

Q: For the addition of 0.1 mol/L NaOH to 25 mL of 0.1 mol/L HCl   prepare a "ph curve" as follows:…

A: Since you have posted multiple questions, we will answer the first one for you. To get the remaining…

Q: Consider the titration of 100.0 mL of 0.250 M aniline ( Kh= 3.8 x 1010 with 0.500M HC1. For…

A: Given: Concentration of HCl = 0.500 M Concentration of weak base aniline i.e. B = 0.250 M Volume of…

Q: 1.2 (i) pH Volume (mL) of 0.1 M NaOH m Above is the titration curve of a weak acid (200 mM acetic…

A:

Q: Determine the pH at the point in the titration of 40.0 mL of 0.200 M HC₄H₇O₂ with 0.100 M Sr(OH)₂…

A: Given:  Volume of HC4H7O2=40 mL  Concentration of HC4H7O2 = 0.200 M Concentration of Sr(OH)2=0.100…

Q: 2. [A] = day of birth [B] = month of birth I was born December 8th, so for me [A] = 8 [B] = 12 Use…

A:

Q: When Sara titrated the 20.00 mL of 0.04 M acetic acid, it required 40.0 mL of 0.02M NaOH to reach…

A: we have to calculate the pH at equivalence point

Q: Consider the titration of 100.0 mL of 0.200 M acetic acid (K a = 1.8 x 10 -5 ) by 0.100 M KOH.…

A:

Q: For the addition of 0.1 mol/L NaOH to 25 mL of 0.1 mol/L HCl   prepare a "ph curve" as follows:…

A:

Q: You want to design a pH 7.20 buffer using solid NaCIO and 500. mL of 0.25 M HCIO. What ratio of base…

A: We have to calculate the ratio of base to acid for the buffer

Q: In the following example, by changing the titration conditions on a weak acid as compared to a…

A: A question based on acid-base titration, which is to be accomplished.

Q: c) A student titrated 50.0 mL of a 0.10 M solution of a certain weak acid with NaOH. The results are…

A: Identify a pH value between 2.5 and 7.5 at which the concentration of the weak acid being titrated…

Q: Calculating the pH at equivalence of a titration A chemist titrates 230.0 mL of a 0.3847 M…

A: At equivalence point the number of moles (nNaOH) of NaOH is equal to the number of moles (nHCN) of…

Q: Construct a rough plot of pH versus volume of added base for the titration of 50 mL of 0.045 M HCN…

A:

Q: What is the H30* | and the pH of a benzoic acid-benzoate buffer that consists of 0.15 M C6H5COOH and…

A: Given, [C6H5COOH] = 0.15M [C6H5COONa] = 0.38M

Q: What is the pH at the equivalence point

A:

Q: -10 What A chemistry graduate student is given 125. mL of a 1.70 M hydrocyanic acid (HCN) solution.…

A: when weak acid HCN ionises in water

Q: 0.10- Formic acid, HFor, has a Kvalue of 1.8 x 10-4. You need to prepare 150 mL of a buffer hav- ing…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: If a titration of HOCl with 0.15 M NaOH reaches the equivalence point at 100 mL NaOH what is the pH…

A: given: Ka = 2.8 × 10-8 a point at which exactly half of the acid in buffer has been nuetralized it…

Q: Please help me...... a. Do you expect the pH at the equivalence to be lowest when a 0.0500 M…

A:

Q: 1)A 30.0-mL sample of 0.165 Mpropanoic acid (CH3CH2COOH, Ka = 1.3 × 10−5) is titrated with 0.300…

A:

Q: pH graph for the 0.20 M strong base titration of 25.0 mL benzoic acid (0.150 M) is shown here. Acume…

A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…

Q: In the titration curve below, which species would NOT be in solution at Point B? Unknown Solution…

A: In the given graph, at B point pH=11

Q: Calculating the pH at equivalence of a titration A chemist titrates 170.0 mL of a 0.2614M cyanic…

A:

Q: Be sure to answer all parts. What is the [H3O+] and the pH of a benzoic acid-benzoate buffer that…

A: Buffer solution: The solution that resists the change in pH is known as a buffer solution. The…

Q: What is the H3O* | and the pH of a benzoic acid-benzoate buffer that consists of 0.13 M C6H5COOH and…

A: Given: Concentration of C6H5COOH = 0.13 M Concentration of C6H5COONa = 0.30 M Ka of C6H5COOH =…

Q: Determine the pH at the point in the titration of 40.0 mL of 0.200 M H2NNH2 with 0.100M HNO3 after…

A: The pH of the solution is the power of protons in the solution. While pOH is related to the basicity…

Q: You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (pK, = 4.20)…

A: Given,  Volume of the buffer solution = 100.0 mL  pH = 4.00  [Benzoic acid] = 0.100 M  [Sodium…

Q: You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (pK, = 4.20)…

A: According to the Henderson-Hasselbalch equation, the pH of a buffer is given by  pH = pKa + log{…

Q: 4. A 30.0 mL sample of 0.135 M aqueous benzoic acid is titrated with 0.115 M aqueous potassium…

A: The question is based on the concept of titrations. we have been  provided a weak acid benzoic acid…

Q: The following results were obtained in the titration of an unknown monoprotic acid (Use data from…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: How many mL of 4.50 M sodium hydroxide must be added to 250 mL of a 0.200 M acetic acid solution to…

A: Given : Concentration of sodium hydroxide i.e NaOH = 4.50 M Volume of acetic acid i.e CH3COOH…

Q: Titration of 100.00mL of a 0.1000M solution of a strong acid HCl with 0.100M NaOH solution.…

A: a.Before addition of sodium hydroxide.  HCl undergoes 100% dissociation to its ions.  Therefore,…

Q: The 1/2 equivalence point is defined as the point at which 1/2 of the volume needed to reach the…

A: Given: The volume of KOH required to reach the equivalence point = 19.24 mL.

Q: A 350.0 mL buffer solution is 0.150 mol L-lin HF and 0.150 mol L-lin • Part A NaF. Ka(HF) = 6.3 x…

A: Given data: Ka = 6.3 × 10-4 pH = 4.0

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.