Wednesday

October 1, 2014

October 1, 2014

Number of results: 59,591

**chem**

The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is ?????? M. The density of the solution is 0.79 g/mL. A) 21 B) 0.93 C) 6.0 × 10-4 D) 1.72 E) 0.58
*September 26, 2010 by benju*

**Chemistry**

The density of a solution of 3.69g KBr in 21.70g H2O is 1.11g/mL. What is the molarity of KBr in the solution.
*October 10, 2010 by Jude*

**Chemistry**

If 36.00 mL of KMnO4 solution are required to oxidize 25.00mL of 0.02932 M Na2C2O4 solution what is the concentration of KMnO4?
*November 2, 2010 by Tilly*

**Chemistry**

If you mix 40.0 mL of a 0.389 M solution of K2CrO4 with 40.0 mL of a 0.389 M solution of AgNO3, what mass of solid forms?
*November 20, 2010 by Angela*

**Chemistry**

A solution is made up by dissolving 14.8 g Na2CO3 · 10 H2O in 110.5 g of water. What is the molality of Na2CO3 in this solution?
*December 20, 2010 by Jintau*

**chemistry**

To what volume should you dilute 126 ml of an 7.90 M CuCl2 solution so that 49.5 ml of the diluted solution contains 5.9 g CuCl2?
*February 20, 2011 by anna*

**Chemistry**

We are using a rotovap to evaporate Hexane from a solution. The temperature of the solution has to remain between 20 to 25 F. What the mm Hg has to be for Hexane?
*August 30, 2011 by Chicago*

**pharmacy tech**

Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.
*April 4, 2011 by rob*

**pharmacy tech**

Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.
*April 4, 2011 by rob*

**chemistry**

what is the molarity of a solution containing 23g of NaCl in 500 mL of solution? (the molecular mass of NaCl is 58.44.)
*April 28, 2011 by lilly*

**Chemistry**

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) If 2.00 g of Mg reacts completely with 50.0 mL of HCl solution, what is the molarity of the HCl solution?
*July 9, 2011 by Jayne*

**Chemistry**

A solution contains 153g Na3PO4 and 415g H2O. What is the percentage concentration of Na3PO4 in this solution
*July 13, 2011 by wj*

**chemistry 105**

to what volume should you dilute 20 mL of a 10 M H2SO4 solution to obtain a 0.130 M H2SO4 solution?
*October 10, 2011 by julie*

**chemistry 105**

to what volume should you dilute 20 mL of a 10 M H2SO4 solution to obtain a 0.130 M H2SO4 solution?
*October 10, 2011 by julie*

**chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*October 24, 2011 by Brittaney*

**Chemistry**

Prepare a 0.025M solution of Glucose by diluting a 1M Glucose solution. What and how much did you mix together?
*October 27, 2011 by Pam*

**chem**

mix 35.50 mL of a 0.201 M solution of K2CrO4 with 35.50 mL of a 0.201 M solution of AgNO3, what mass of solid will form?
*November 29, 2011 by darren*

**chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*December 7, 2011 by Anonymous*

**chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*January 5, 2012 by Anonymous*

**math**

The IV dose of mannitol is 1.5g/kg, administered as a 15% solution. How many mls of the solution should be administered to a 150lb patient?
*February 2, 2012 by Vicki*

**Chemistry**

How much distilled water must be added to .85% solution Of NaCL to make a 70% solution of NaCl
*February 15, 2012 by Joan*

**algebra**

How much water should be added to 20oz of a 15% solution of alcohol to dilute it to s 10% alcohol solution?
*February 24, 2012 by rhonda*

**Chemistry**

what mass of AgBr is formed when a solution containing 3.45 g of KBr is mixed with a solution containing 7.28 g AgNO3?
*April 14, 2012 by David*

**chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*June 13, 2012 by Anonymous*

**Algebra**

A chemist has 40 ml of a solution that is 50% acid. How much water should be added to make a solution that is 10% acid?
*October 8, 2012 by Steven*

**algebra**

solve the equation(enter solution from smallest to largest. if there no solution enter none) 4x^2=15x+4
*October 28, 2012 by missfubu-c*

**science**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*November 1, 2012 by john*

**chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*December 21, 2012 by alexis*

**chemistry**

A student has a solution with a mole fraction of 0.20 of chloroform in carbon tetrachloride. What is the molality of chloroform in the solution?
*January 5, 2013 by Anonymous*

**Chemistry**

What is the molarity of a nitric acid solution if 43.33 mL of 0.10000 KOH solution is needed to neutralize 20.00 mL of the acid?
*January 23, 2013 by Anonymous*

**science:Chemistry**

Find the pH of a solution obtained by mixing 100cm3 of 01MHCl solution with 100cm3 of 0.2M NaOH
*January 31, 2013 by Anonymous*

**chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*February 13, 2013 by diana*

**Chemistry**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*March 18, 2013 by Noemi*

**chemistry**

to what volume should you dilute 0.100L of a 15M NaOH solution to obtain a 1.0M NaOH solution
*July 10, 2013 by veronica*

**Math**

Simplify or solve as appropriate. Enter ns if there's no solution or all if the solution is all real numbers. 2 - 3(x + 5)) = 10 X = -7.6 7z + 6 - 2(z + 3) 5 * z 1/2x - 5 = 3/4x + 7 X = -48
*November 19, 2013 by Alan*

**Math**

I have a graph which is graphed by the equation f(x) = |x| - 4 and I'm asked to find the solution to the equation f(x) = 0. What would the solution be?
*February 5, 2014 by Anonymous*

**chemistry**

To what volume should you dilute 60mL of a 12.0M H2SO4 solution to obtain a 1.85M H2SO4 solution?
*April 8, 2014 by Amy*

**algebra**

what is the solution for 3x=27-15x and what is the solution for 7(2-m)=3m
*September 29, 2009 by Cristine*

**Algebra 1B**

ax^2+bx+c=0 solution: 9, only solution
*January 22, 2011 by Tabitha*

**physics**

What is a solution? What are the 2 parts of a solution
*January 20, 2012 by keria*

**science**

How many ml of a 2% solution will 20 ml of a 10% solution make?
*September 11, 2012 by jenny*

**Chem Help :(**

What is the pH of a solution in which [H3O^+] = 6.8 x 10^-5 M? What is the pH of a solution in which [OH^-] = 2.5 x 10^-9 M?
*February 17, 2014 by Tom *

**Chemistry(Please check)**

What is the molar solubility of barium phosphate in a 0.282M barium acetate solution? If I set up and ice table I would have 0.282M - X = ? Would I use the molar mass of barium acetate to complete the equation to find X?
*April 26, 2012 by Hannah*

**Organic Chemistry**

how many grams of ZnCl2 are needed to prepare 250 ml of an aqueous solution with an osmolarity equal to 0.300 osmol? I posted this question a few minutes ago, but forgot to add the last part of the sentence. Thanks!
*March 6, 2012 by Jules*

**Bio Chem**

Carbonate is commonly used to buffer household detergent solutions to a pH of 9.0. How many grams on NaHCO3 and how many grans of NA2CO3 are needed to prepare 0.75L of a 100mM solution? The 2nd pKa of carbonic acid is 10.33.
*September 4, 2014 by Cassandra *

**CHEMISTRY TITRATION Q**

The titration of 25.00mL of Ba(OH)2 solution with an aqueous solution of 0.500 M HCl reaches an end point when 30.20 mL of the HCl solution is added. Determine the concentration of M of the Ba(OH)2 solution. Soo 25.00mL=0.025L 30.20mL= 0.0302L moles= MxL (0.500M)(0.0302L)=0....
*December 15, 2010 by LISA*

**Chemistry**

Consider the titration of 100.0 mL of 0.260 M propanoic acid (Ka = 1.3 ✕ 10−5) with 0.130 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL...
*December 8, 2013 by Rina*

**Chemistry**

Caffeine C8H10N4O2, is a stimulant found in a tea and coffee. A sample of the substance was dissolved in 45.0g of choloroform CHCl3 to give a 0.0946m solution. How many grams of caffine were in the sample. m = molality
*February 6, 2008 by Lauren*

**DR.BOB HELP CHEMISTRY!**

How many milliliters of a 0.3 molar HCl solution are needed to react completely with 8 grams of zinc according to the following equation? ? HCl + ? Zn → ? ZnCl2 + ? H2 Answer in units of mL
*October 4, 2011 by Rara*

**Chemistry**

assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .
*January 27, 2012 by Colin*

**Chemistry**

You have two beakers, one filled to the 100-mL mark with sugar (the sugar has a mass of 180.0 g) and the other filled to the 100-mL mark with water (the water has a mass of 100.0 g). You pour all the sugar and all the water together in a bigger beaker until the sugar is ...
*September 3, 2011 by Alexandria*

**CHEMISTRY**

1)If 36 mL of KMnO4 solution are required to oxidize 25 mL of 0.02932 M NaC204 solution, what is the concentration of the solution? 2)A Certain brand of iron supplement contains FeSO4-7H2O with miscellaneous binders and fillers. Suppose 22.93 mL of the KMn04 solution used in ...
*November 1, 2010 by yipez*

**CHEMISTRY**

1)If 36 mL of KMnO4 solution are required to oxidize 25 mL of 0.02932 M NaC204 solution, what is the concentration of the solution? 2)A Certain brand of iron supplement contains FeSO4-7H2O with miscellaneous binders and fillers. Suppose 22.93 mL of the KMn04 solution used in ...
*November 1, 2010 by yipez*

**chemistry**

calculate the number of Mg2+ ions in each mL of 0.162M(molarity) magnesium bromide
*October 26, 2008 by ben*

**chemistry**

Mr. Arswan iss preparing a mixture for a science experiment. He measures 10.5 grams of wood shavings, 150 grams of iron filings, and 18.50 grams of salt. What is the total mass of Mr. Arswan`s mixture? A 30.5 grams B 179 grams C 150.5 grams D 17.9 grams
*October 6, 2013 by na*

**Chemistry**

Hg2+ + 2Cl- → HgCl Mercuric nitrate was standardized by titrating a solution containing 147.6 mg of NaCl(FM 58.44), which required 28.06 ml of Hg(No3)2 solution. Part a: Find the molarity of Hg(No3)2. I already calculated the molarity to be 0.04500 M Part b: When the ...
*October 16, 2011 by Asuna*

**Chemistry**

Ammonia has the formula NH3. Household ammonia is a dilute aqueous solution of NH3 . Aqueous ammonia is a base that can neutralize acids. If 18.4mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentration of the ...
*February 11, 2009 by Chemistry*

**math **

How many cubic centimeters of a 25% antibiotic solution sould be added to 10 cubic centimeters of a 60% antibiotic solution in order to get a 30% antibiotic solution?
*October 18, 2009 by james *

**math **

How many cubic centimeters of a 25% antibiotic solution sould be added to 10 cubic centimeters of a 60% antibiotic solution in order to get a 30% antibiotic solution?
*October 18, 2009 by james *

**chemistry**

the density at 20 degrees celcius of a .258m solution of glucose in water is 1.0173 g/ml, and the molar mass of glucose is 180.2 g/mol. What is the MOLARITY of the solution?
*October 20, 2008 by Eric GReenblatt*

**Science**

If pale green FeCl2 solution is left in the open for some time, will some of it gradually oxidise to become brown FeCl3 solution?
*January 31, 2009 by candy*

**Algebra**

Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form ax^2+bx +c = 0 The solution is 6 only solution.
*May 5, 2009 by aaron*

**chemistry**

A 1.10- sample contains only glucose and sucrose . When the sample is dissolved in water to a total solution volume of 25.0 , the osmotic pressure of the solution is 3.78 at 298 .
*January 24, 2010 by bf*

**Chemistry**

Determine the boiling point elevation of H2O in the following solution a 2.5 m solution of C6H12O6 in H2O All i need is the formulas because i dont know how to solve it Thank you :l
*March 7, 2010 by Veronica*

**algebra**

write a quadratic equation in the variable x having the given numbers as the solutions. type the equation in standard form ax^2+bx+c=0 solution 6, only solution
*July 11, 2010 by sam*

**math**

Solve the problem. If the answer is an amount of money, round to the nearest dollar. A chemical solution contains 3% salt. How much salt is in 4.5 ml of solution?
*August 17, 2010 by Sarah*

**chemistry**

The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H2O is __________ M. The density of the solution is 1.3 g/mL. i get 8.9 but the practice test says the answer its 6.3
*September 26, 2010 by BenY*

**chemistry**

The boiling point of an aqueous solution is elevated by 0.15 degrees celcius. the change in freezing point of the solution, delta T, is? a.) -6.32 b.) 0.15 c.) -0.15 d.) 0.54 e.) -0.54 I know the answer is d, i just don't understand how to get it! thanks!
*December 14, 2010 by Emily*

**Algebra**

Graph the two equations to solve the system. Write the ordered pair solution like this (1,2) with no spaces, or write no solution or infinitely many solutions. x + y = 6 and x - y = 4
*January 30, 2011 by joshua*

**Algebra**

Graph the two equations to solve the system. Write the ordered pair solution like this (1,2) with no spaces, or write no solution or infinitely many solutions. 1/2 x - 2y = 4 and 4y - x = -8
*January 30, 2011 by joshua*

**algebra**

write a quadratic equation in the variable x having given the numbers as sollutions type the equation in standard form ax^2+bx+c=0. solution 4 only solution
*February 8, 2011 by ella*

**chemistry **

predict whether or not a precipitate will form if you mix 75ml of a NaOH solution with pOH = 2.58 with 125ml of a 0.018M MgCl2 solution. Identify the precipitate, if any.
*April 9, 2011 by glenn *

**Chem/Solution Concentrationa**

How many gtams of potassium bromide(KBr), could be recovered by evaoportating 650.g of 15 percent KBr solution to dryness? Can you explain how to solve this?
*August 3, 2011 by Terr*

**algebra**

a scientist has a 25% acid solution.how many liters of each does the scientist need to make 15L of a solution that is 28%.write a system of equations and solve using any method.
*November 10, 2011 by geena*

**Chemistry**

How many mL of a solution of NaOH with pH equal to 1.395 x 101 do you need to mix with pure water to obtain 399 mL of a final solution with pH equal to 9.066 ?
*January 17, 2012 by Summer*

**chemistry**

What volume of solution would be needed to deliver the stated amount of solute? 237 milligrams of solute from a solution that is 32.0 ppm? answer in liters
*April 26, 2012 by toby*

**Chemistry**

Pb(NO3)2(aq) 2 x 10-3 M Na2SO4(aq) 2 x 10-3 M Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) a) What are the concentrations of each ion within this solution? b) If 1L of each solution is mixed; will a precipitate form? why?
*May 15, 2012 by Jake*

**chemistry**

20mL ethanol(density=o.789g/mol) is dissolved in sufficient water to produce a 200mL solution. the density of the solution is 0.982g/mL. what is the molarity?
*March 11, 2013 by mj*

**Aqueous Solution **

Write the positive and negative ions that result when the following compounds are dissolved in aqueous solution: Na2S (aq): (NH4)2CO3 (aq): K2SO4 (aq):
*March 17, 2013 by Annette W*

**aqueous solution**

Write the positive and negative ions that result when the following compounds are dissolved in aqueous solution: Na2S (aq): (NH4)2CO3 (aq): K2SO4 (aq):
*March 21, 2013 by Annette W *

**Alg 1**

Find the exact solution for each equation. Find the approximate solution to the nearest tenth. 5 sq rt 2/ sq rt 2 -1 = x / sq rt 2 Please explain in detail how to work this. I am really confused. Thanks
*April 3, 2013 by Jane*

**Chemistry**

A student mixes 450 mL of water and 116 mL of 7.90 x 10-5 M greenfood dye solution. What is the concentration of this new dilute solution of green food dye?
*April 29, 2013 by Tif*

**chemistry**

An aqueous solution of copper (II) sulfate is a thermodynamic system under study. What typer of system is this if the solution is contained in a beaker on a laboratory table?
*October 26, 2013 by Grace Peterson *

**chemistry**

A 25.0-ml sample of 1.00M KBr and a 75.0-ml are mixed. The solution is then heated to evaporate water until the total volume is 50.0 ml. What is the Molarity of the KBr in the final solution
*February 9, 2014 by Mary*

**College Chemistry**

A solution is saturated in both nitrogen gas and sodium iodide at 50 degrees C . When the solution is cooled to 25 degrees C what is most likely to occur?
*March 23, 2014 by Brandy*

**Chemistry**

What is the ionic strength, I, of a solution at 25C containing 0.002 mol/L of BaSO4 and 0.001 mol/L of BaCl2? What is the activity coefficient of Ba2+ in this solution?
*April 8, 2014 by Me*

**chemistry **

A sample of solid ammonium chloride, NH4Cl, is dissolved in water. The solution formed was found to be acidic. Can you please explain why the solution is acidic?
*July 14, 2014 by lilliso *

**chemistry**

The total acidity in water samples can be determined by neutralization with standard sodium hydroxide solution. What is the total concentration of hydrogen ion, H+, present in a water sample if 300. mL of the sample requires 7.5 mL of 2.8 10-3 M NaOH to be neutralized? im ...
*March 26, 2009 by lyne*

**Physical Science**

To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two safety procedures the ...
*January 12, 2011 by SHAZAM*

**chemistry**

Which solution would CaC2O4 be most soluble in? Na2C2O4 NaHC2O4 H2C2O4 NaCl HCl I due to common ions i think it would be one of the first three and i think it is Na2C2O4 because the other 2 have Hydrogen. Is it Na2C2O4? No, the common ions work just the other way; CaC2O4 will ...
*April 7, 2007 by jacob*

**NEED HELP WITH CALC**

Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
*June 27, 2014 by Anonymous*

**chemistry**

Calculate the concentration, in percent by mass, of a refrigerant brine solution which is 4.03 M in NaCl with a density of 1.116 g mL-1.
*November 9, 2007 by keely*

**chemistry**

Calculate the Ka of nitrous acid if a 0.200 mol/L solution at equilibrium at SATP has a percent ionization of 5.8%
*April 5, 2008 by Laura*

**chemistry**

Calculate how much energy will be released when 11.11g of calcium chloride are dissolved in 100ml of solution
*May 2, 2009 by Mandy*

**chemistry**

Commercial bleach contains 5.25% (by mass) of NaClO in water. It has a density of 1.08 g/mL. Calculate the molarity of this solution.
*March 3, 2010 by Drew*

**Chemistry**

Calculate the freezing- and boiling-point changes for a solution containing 12.0 g of naphthalene (C10H8) in 50.0 g of benzene.
*May 2, 2010 by Mariah*

**chemistry**

calculate the percent composition or w/v% of 3x10 to the 2nd power mL solution containing 15g of glucose
*May 4, 2010 by Quentin*

**Chemistry**

What formula do I use to calculate the mass of KCl that is required to make 625 mL of a 0.200 M solution?
*July 25, 2010 by Norma*

**Chemistry**

Calculate the freezing point of each of the solution 75.0 of glucose,C6H12O6 , added to 9.30×10−2 of water.... Please help
*December 6, 2010 by Garrett*

**science**

You add 12.5 mL of 4.15 acetic acid to 25.0 mL of 1.00 M NaOH. Calculate the hydronium ion concentration and pH of the resulting solution.
*March 7, 2011 by Bill*

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