In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight overvolume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/w) it usually assumed that 1 mL of water = 1 gram ofwater. This is similar to assuming molarity (mol/L) equals molality (mol/kg)In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab þench or research tools such as forceps. In order to produce a finalvolume of 200 mL of 70%(wtvol) ethanol, how many mL of 99%(wt/vol) ethanol would you need to add?The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanolout of 100 mL of solution. Therefore, it is possible to use m,v, = m,v2 and use the percentages as the concentration values.Report your answer rounded to two decimal places

We have to find volume needed to make solution

In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/wy it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) order to produce a final In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab pench or research tools such as forceps. volume of 200 mL of 70%(wt/vol) ethanol, how many ml of 99%(wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m,v = m,v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places

In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as %(wt/wy it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) order to produce a final In lab, 70%(wt/vol) ethanol is frequently used to sanitize the lab pench or research tools such as forceps. volume of 200 mL of 70%(wt/vol) ethanol, how many ml of 99%(wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m,v = m,v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Calculate the molarity of a solution made by dissolving 0.382 mol glucose in enough water to make 1.32 L of solution. Your number should be followed by the correct symbol for molarity, but do not include "glucose" as part of your answer.
A Moving to another question will save this response. Question 20 Some graduate students have a solution of 1 M NaCl in the lab. What volume of the NaCl solution and what votume of water do they need to mix together to make 1 L of 0.035 M NaC? O 35 mL of 1M NaCl and 35 mL of H20 O 35 ml of 1M NaCl and 965 mL of H20 O 35 mL of 1M NaCl and 65 mL of H20 O 3.5 mL of 1M NaCl and 6.5 mL of H20 A Moving to another question will save this response. K< Qu MacBook Pro 46 888 F4 V8 FS F3 & %23 24 3 4. T K V. B F. 1R C. E. S'
From the diagram below, at 10° C, roughly how many grams of NH3 can be dissolved in 100 grams of H2O? a. 70 b. 45 c. 90 d. 100
Calculate the mass of NaOH in 300.0 mL of an 8.00% w/w NaOH solution. Density is 1.09 g/mL.
3. An important conversion factor that you must memorize and use in this course is: 1 mg/L = 8.34 lb/million gallons a) Start with a value of 1 mg/L and use dimensional analysis to prove that this conversion factor is correct: Show that 1 mg/L = 8.34 lb/million gal. b) A wastewater treatment plant adds 5 mg/L of a commercial polymer to raw water to enhance removal of colloidal particles during settling. If the flow rate of water into the facility is 100 MGD, how many pounds of polymer are needed each year? (hint, use the required conversion factor 1 mg/L = 8.34 lb/million gallon to perform the calculation)
Just the first one please!
Do not use chatgpt.
Calculate the mass percent of solute in the following solutions: 1.) 6.50 grams of NaCl dissolved in 85 grams of water. 2.) 12.5 grams of KNO3 (Potassium nitrate) dissolved in 125 grams of water. 3.) 0.0032 grams of NaOH dissolved in 1.2 grams of water. Note: Express your final answer in two decimal place.
> A Moving to another question will save this response. uestion 3 What mass of NaOCOCH3 is needed to make 20.0 mL of a 1.00 M solution? Molarity (M) = moles / Liter 1640 g 4100 g 0.0200 g 1.64 g 1.00 g A Moving to another question will save this response. étv NOV 4
1. Which solution-0.50 M NaCl or 0.25 M SrCl₂-has the larger concentration when expressed in mg/mL? **The solution of SrCl₂ has the larger concentration when expressed in mg/mL instead of in mol/L** ??? 2. What is pK and pSO4 for a solution containing 1.5 g K2SO4 in a total volume 500.0 mL? K₂SO4
A scientist needs to make a 250 mL of a solution of ethanol in water that has a molaritv of 0.12 Unfortunately, the only scales are available. [Water: M = 18.02 g/mol, d=0.997 g/mL] [Ethanol: M = 46.07 g/mol, d = 0.789 g/mL]) a. Calculate the mass of each substance needed to make this solution. b. Calculated the volume percent of each substance?
Can you help me with question 1?