Scarlett wants to make a buffered solution to clean the marker that Ada has generously donated to the wall in her bedroom. She needs to make an ideal buffer that has a basic pH. With her extensive chemistry experience, she knows she can use sodium carbonate (Na2CO3) and 1.0 M HCl to make the buffer she wants. Sodium carbonate is a dibasic base. The pKb of ,)# *M is 3.68 and the pKb of ",)# M is 7.65. The pKa of HCl is -10. **Hint** dibasic bases can make more than one ideal buffer If Scarlett needs 4 L of buffer with a total concentration of [CO3] = 0.25 M and a basic pH, calculate the gram amount of Na2CO3, volume of 1.0 M HCl and any additional water needed to create the buffer.

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon

What type of chemical bond is formed between two atoms of bromine 1. metallic 2. hydrogen 3. ionic 4. covalent