Q3: When performing a gram stain, it is necessary to remove crystal violet stain from any gram negative bacteria on the slide. Microbiologists use a decolorizing solution to accomplish this. A common recipe is equal parts 95% ethanol and acetone.  How many mL of water would you need to add if you have 98% ethanol and want to end up with 460 mL of decolorizer? Report your answer to 2 decimal places and perform all calculations in a singlet step using Excel to avoid accruing rounding error.

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A lab assistant needs to neutralize a 3.1 M solution of HCI. If there are 350 mL of solution, what volume, in Liters, of a 1.8 M NAOH solution would have to be used? (Hint: You will need to write out the equation and balance it first.) Be sure to report your answer to the correct number of significant figures. Do not report the units (L) in your answer.

Calculate the volume in liters of a 129. g/dL silver perchlorate solution that contains 255. g of silver perchlorate (AgClO,). Be sure your answer has the correct number of significant digits. x10 ?

chemist prepares a solution of sodium carbonate Na2CO3 by measuring out 36.6μmol of sodium carbonate into a 150.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in /molL of the chemist's sodium carbonate solution. Round your answer to 3 significant digits.

The sugar industry uses barium hydroxide solution to refine sugar beets. What is the amount concentration of a barium hydroxide solution when 5.43 g is dissolved in 165 mL of water?   Record your numerical answer with the correct number of significant digits in the first answer box and your units in the second answer box.

For liquid B, you decide to use a 50 mL burette to once again dispense 5.00 mL of liquid B into a convenient container.  You find that the empty container has a mass as 3.05 grams.  After obtaining the mass of the empty container you place it beneath the burette and open the stopcock valve.  Although you try to stop the flow of liquid B at exactly the 5.00 mL mark you overshoot slightly and end up dispensing 5.14 mL. What  is  the  mass  of  liquid-B  that  was  dispensed  if  you  continue  with  the  density determination for liquid B and find that the mass of the container plus the 5.14-mL of liquid B is 7.63-grams?