I cannot figure out this problem, I've made a few attempts at solving it. I could...

I cannot figure out this problem, I've made a few attempts at solving it. I could really use some help. The question is : 75.00 mL of 0.225 M HNO2 is titrated to its equivalence point with 0.100 M NaOH. What is the pH at its' equivalence point? Please help!

Expert Solution

HNO2 + NaOH ---------------------> NaNO2 + H2O

75x 0.225 75x0.1 0 0

16.875 7.5 0 0 ------------------initial millimoles

9.375 0 7.5 7.5 -------------- at equivalent point

in the solution HNO2 + NaNO2 remained . so it is buffer

For acidic buffer

Henderson-Hasselbalch equation

pKa = -log Ka = -log(4.0 x 10-4) = 3.39

pH = pKa + log[salt/acid]

pH = 3.39 + log[7.5/9.375]

pH = 3.29

queen_honey_blossom answered 1 year ago

I am trying to figure out the best way to solving a problem in the language...

I am trying to figure out the best way to solving a problem in the language python. I have some but have no clue if I am even going in the right direction. Here are the instructions: Write a program that calculates the shopping list for a birthday party with the minimum amount of leftovers. The program should ask the user for the number of kids attending the party. Assume each kid will cook (but not necessarily eat) 2 hot...

I have done the first part of this problem, but I cannot figure out the second...

I have done the first part of this problem, but I cannot figure out the second part. I know there are several different answers already posted on Chegg for this particular problem with different acceleration and time, but I need this one specifically, with a step by step solution. Again...just PART B....the answer to Part A is 201.72 A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 4.20 m/s2. Secret agent Austin Powers jumps on just...

I cannot for the life of me figure out the definitions of the correspondence, coherence, pragmatic...

I cannot for the life of me figure out the definitions of the correspondence, coherence, pragmatic and semantic theories of truth. I've tried deciphering the definitions from my textbook but I still can't wrap my head around it. I need someone to dumb it down for me. Thank you in advance.

For Python, I cannot figure out why "and" is printing at the beginning of my list....

For Python, I cannot figure out why "and" is printing at the beginning of my list. Can someone help? listToPrint = [] while True: newWord = input("Enter a word to add to the list (prest return to stop adding words) > ") newWord == "": break else: listToPrint.append(newWord) for item in listToPrint[:-1]: print(item, end=', ') print('and', listToPrint[-1]) If I enter m, n, b to the list, it executes to and m, n, b

I keep getting an error that I cannot figure out with the below VS2019 windows forms...

I keep getting an error that I cannot figure out with the below VS2019 windows forms .net framework windows forms error CS0029 C# Cannot implicitly convert type 'bool' to 'string' It appears to be this that is causing the issue string id; while (id = sr.ReadLine() != null) using System; using System.Collections.Generic; using System.IO; using System.Windows.Forms; namespace Dropbox13 { public partial class SearchForm : Form { private List allStudent = new List(); public SearchForm() { InitializeComponent(); } private void SearchForm_Load(object...

Show work please, this is the last problem for my homework and I cannot figure this...

Show work please, this is the last problem for my homework and I cannot figure this out for the life of me An IP4 datagram arrived with the following information in the header (in hexadecimal): 0x4A 00 00 56 00 03 58 50 18 06 58 50 7C 4E 03 02 B4 0E OF 15 2f………. Are there any options? How many bytes, if any? How many more routers can the packet travel to? Explain. What is the size...

I CANNOT FIGURE THIS OUT FOR THE LIFE OF ME. *(It's not 570 actual labor hours;...

I CANNOT FIGURE THIS OUT FOR THE LIFE OF ME. *(It's not 570 actual labor hours; I keep getting that)* The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Standard Hours Standard Rate Standard Cost Motor tune-up 2.60 $4.00 $10.40 The record showing the time spent in the shop last week on motor tune-ups has been misplaced....

I am attempting to calculate the annual net cash flow for this problem and cannot figure...

I am attempting to calculate the annual net cash flow for this problem and cannot figure out how to solve it. Case Study: Alexander & Sons Alexander & Sons Company is currently considering the purchase of equipment that produces mugs. The equipment needed would cost $3 million, with a disposal value of $400,000. The equipment would be able to produce 55 million mugs over its 5-year life. The company has estimated that approximately 11 million mugs would be sold for...

Can you figure out of the value at risk is a measure that attempts to capture...

Can you figure out of the value at risk is a measure that attempts to capture the risk within a firm or investment portfolios. And the way of calculating value at risk assumes that daily returns are distributed according to a normal distribution and with high confidence of 95 percent, we can then calculate the value at risk as 1.65 standard deviations below the mean. That approach has been criticized following the financial crisis of 2008. Do you know the...

This is the HW question I cannot get the correct answer for. I've completed the first...

This is the HW question I cannot get the correct answer for. I've completed the first step but I cannot seem to get the correct numbers for EFN for 20, 25 and 30%!?!? See below for given financial statements and my table with the pro forma of 20, 25 and 30% numbers The most recent financial statements for Scott, Inc., appear below. Interest expense will remain constant; the tax rate and the dividend payout rate also will remain constant. Costs,...

Question