The initial pH of a 250.0 mL buffer that consists of 0.15 M nitrous acid and 0.13 M sodium nitrite is 3.41.  Calculate the pH of the buffer after 1.00 mL of 5.0 M HCl is added to the buffer. (

An aqueous solution of sucrose (MW = 342.3 g/mol) has a weight percent of 16.0% and a solution density of 1.0635 g/mL. Calculate the molarity of sucrose in the solution. For your answer, enter numbers only with 4 significant digits.

You want to prepare a solution of 0.300 M FeCl2 (). How many grams of FeCl2 do you need to weigh out if you are preparing your solution in a 100.0-mL volumetric flask? 

Calculate the balance under the given assumptions.Find the savings plan balance after 18 months with an APR of 4% and monthly payments of $543.

Solve the problem.You want to have a $60,000 college fund in 12 years. How much will you have to deposit now in an account with an APR of 5% and quarterly compounding?

Calculate the balance under the given assumptions.Find the savings plan balance after 10 years with an APR of 4% and monthly payments of $567.

Use the compound interest formula to determine the accumulated balance after the stated period. Assume that interest is compounded annually.$15,000 is invested at an APR of 8% for 5 years.

Calculate the amount of interest you’ll have at the end of the indicated period.You invest $8000 in an account that pays simple interest of 3% for 13 years. Save

Use the compound interest formula for compounding more than once a year to determine the accumulated balance after the stated period.$4500 deposit at an APR of 3% with monthly compounding for 6 years

Use the compound interest formula to determine the accumulated balance after the stated period. Assume that interest is compounded annually.$18,000 is invested at an APR of 8% for 5 years.