Friday
May 6, 2016

# Posts by Fai

Total # Posts: 128

chemistry
Concentrated hydrochloric acid has specific gravity of 1.18 and 36% hcl weight. What volume of concentrated hcl must be diluted to give 50 gm of 10 percent. My calculation 50gm x 0.1 = 5gm 5gm x 36.5 = 182.5 182.5 / 0.36 = 506.9 506.9 / 1.18 = 430 ml This is answer. I am not ...
August 9, 2012

chemistry
A 0.446g sample of an unknown monoprotic acid was titirated with 0.105M KOH the molar mass is 120g/mol. What is the PKA value? Who helps me to solve it for me. Step by step.
August 5, 2012

chemistry
I do not still understand how to calculate PH 1.9 = 0.0126M I want step by step to calculate for me. Thank you for your help.
August 5, 2012

chemistry
How to calculate PH 1.9 = 0.0126M Why? How to calculate PH 1.8 = ? How to calculate PH 20 = ? How to calculate PH 21 = ? Pls helps me
August 5, 2012

chemistry
A solution of sodium cyanide NACN has a PH of 12.10. How many grams of NACN are in 425ml of solution with the same PH? Please helps me to solve it for me
August 5, 2012

chemistry
A 0.446g sample of an unknown monoprotic acid was titrated with 0.105M KOH the molar mass is 120g/mol. What is the PKA value Who helps me to solve it for me. Please help
August 4, 2012

chemistry
how to calculate PH =1.9 therefore =0.0126M I do not understand only this part about PH = 0.0126M Please tells me how to calculate the PH = 1.9 = 0.0126M Other way to calculate 0.0126Moles = PH 1.9 0.0126M x 4.85L=0.061mole 0.061mole x 36.46 = 2.22g 2.22g /0.36 = 6.16 6.16/1....
August 4, 2012

chemistry
What volume of a concentrated hcl solution which is 36% by mass and has a density of 1.179 g/ml to make 4.85L of an hcl solution with ph of 1.9? Who helps me to solve it for me.
August 4, 2012

chemistry
A sample of solid monoprotic acid with molar mass equal to 169.7 g/mol was titrated with 0.1599M sodium hydroxide solution. Calculate the mass in grms fo acid to be used if the volume of NAOH to be used is 25ml. My calculation 0.1599 x 0.025L = 0.00399 0.00399 x 1000 = 3.9975 ...
August 4, 2012

chemistry
A volume of 40.0 of aqueous potassium hydroxide was titrated against a standard solution of sulfuric acid h2so4. What was the molarity of the solution if 20.02 of 1.50M h2s04 was needed? Who helps me to solve it for me.
July 31, 2012

Pure pharmacy math
How many ml of terpin hydrate elixirs containing 33mg/5ml and 5mg/5ml needed to prepare 6 fl oz of an elixir containing 4mg terpin hydrate per ml? My calculation: 33mg/5ml = x/100ml - 660mg changes 0.66gm 5mg/5ml = x/100ml - 100mg - 0.1gm 4mg/1ml = x/100ml - 400mg - 0.4gm 1oz...
July 31, 2012

Chemistry
How much ethanol C2H50H in liters d=0.789g/ml must be dissolved in water to produce 190.5 of 1.65M c2H50H ? Molarity problem. Who helps me to solve it for me. My calculation 0.789g/ml x 1000ml/46.06 = 17.12M 17.12M = 190.5 x 1.65 17.12M = 314.325 x= 314.325/17.12 x = 18.36ML I...
July 30, 2012

chemistry
How much concentrated hydrochloric acid solution 36% HCL by mass d=1.18g/ml in milliliters is required to produce 11.0L of 0.296 M HCL? My calculation 1.18 x 1000ml x 0.36/36.5 = 11.6M 11.6M = 11000ml x 0.296 11.6m = 3256ml x= 3256ml/11.6 x= 280ml. I am not sure the right ...
July 29, 2012

Pharmacy Math
A prescription calls for 250ml of a 0.1N hydrochloric acid HCL solution. How many ml of concentrated hydrochloric acid are needed to make this solution? The specific gravity hydrochloric acid is 1.18 the molecular weight is 36.46 and the concentration is 37.5% because ...
July 29, 2012

chemistry
A solution of sodium cyamide nacn has a ph of 12.10. How many grams of nacn are in 425ml of solution with the same PH Who helps me to solve it for me. Step by step
July 29, 2012

chemistry
Calculate the PH concentrated hydrochloric acid if this solution is 24.8% HCL by weight and has a density of 1.16g/ml. I do not understand the right answer 0.90PH Why? Please help My calculation 1.18g/ml x 1000ml x 0.248/36.5 = 7.8M I cannot do?
July 29, 2012

Chemistry
Concentrated hydrochloric acid is a 38% solution of HCL in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of 1:200 HCL solution? The answer is not 2.12ml My calculation: 1.18g/ml x 1000ml x 0.38/36.5 = 12...
July 29, 2012

Pharmacy math
How much dil HCL (10% w/w) HCL specific gravity = 1.045 would be required to prepare 2000ml of a solution containing 0.005 molar HCL? HCL m.w.t = 36.5 Who try to solve for me. Please help The right answer is 34.9ml
July 28, 2012

Pharmacy math
concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? Who helps me to solve it for me. I think 2.12 ml is not right.
July 24, 2012

Intermediate algebra
Factor the following expression completely: 9x^4-81y^2
May 2, 2012

chemistry
1.2g/ml x 1000ml x 0.37 / 36.5 = 12.16M 12.16m= 2500ml x 0.5 12.16m = 1250ml x = 1250ml/12.16 x = 103 ml This is answer.
November 6, 2011

I am a certified pharmacy technician
1ounce= 30ml 12x30ml =360ml 360ml x 9% = 32.4ml 4%X + 12Y(360ml-X)= 32.4ml 0.04X + 43.2ml + 0.12X = 32.4ml 0.076X = 10.8ml x= 142.ml 4% y = 360-142.1ml y= 218ml 12%
March 9, 2011

chemistry
My own calculation 1.179g/ml x 1000ml x 0.36/36.5 x = 11.62 11.62M = 4.6 L change 4600ml 11.62 M = 4600ml x 1.9 11.62M = 8740ml X= 8740ml/11.62 x= 752ml
December 6, 2010

Chemistry
0.79g/ml x 76.9ml = 60.7g 60.7g /46.06 = 1.3 mole 1.3/ 0.25 L = 5.2M
May 6, 2010

Chemistry
My calculation 0.791g/ml x 75ml /46 g/mol = 1.29M 1.29M /0.15KG x= 0.116M
February 10, 2010

Chemistry
0.1879M x 0.025L = 4.6975 mols 4.6975 x 137.9 = 647.78 changes 0.647gm I am not sure answer who tells me the right. Pls help
October 8, 2007

surface energy budget
I'm give the following data: Q*, QG, QH, QE for a 24-hour period, i'm required to plot these 4 data on the same graph, which I've already done. I'm also required to compute these 24 hours totals - transfer of sensible heat to the atmomsphere - transfer of ...
October 2, 2006

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