# Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 41-
## Chemistry

To illustrate the calculation, assume that 21.95 mL of a thiosulfate solution is required to reduce the iodine liberated by 20.85 mL of 0.0200M KIO3 and that 18.63 mL of the same thiosulfate solution reacts with the iodine replaced by 20.00 mL of an

*asked by Marcus on April 26, 2013* -
## Physical Chemistry

One potential problem with using molarity to express concentration is that molarity is temperature dependent. If you make a 1.000 M solution of aqueous HCl at 25 degrees celsius, what would the molarity of this solution become if the temperature of the

*asked by Matt on September 29, 2017* -
## chem

a 45.8mL sample of a 5.8 M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0g KNO3? how do you do this? moles of solution: 5.8*.0458 moles Grams of solute= moles*molmassKNO3 Volume of 15g= 1000ml*15/gramssoluteabove

*asked by kyle on April 5, 2007* -
## Chemistry

100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 15.2mL of 0.35M NaOH. What is the pH of the resulting solution? 100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 28.3mL of 0.25M HCl.

*asked by Anonymous on September 29, 2018* -
## 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

*asked by SHAZAM on January 12, 2011* -
## Chemistry

Please help! I'm trying to find the solubility of Ca(OH)2 in .001305 mol/L aqueous NaOH? Saturated solution of Ca(OH)2 in 0.01305 mol/L NaOH. [HCl] = 0.1213 M Volume of HCl = 9.81 mL Volume of Ca(OH)2/NaOH aliquot = 25ml Find: 1. the TOTAL [OH-] in the

*asked by Alex on March 20, 2017* -
## chemistry

You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of

*asked by anonymous on November 18, 2015* -
## chemistry

does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else? The zinc displaces the lead. You can observe the lead preipitating on the zinc surface. The zinc changes to black crystals which dissolve in the

*asked by Nabiha on June 20, 2009* -
## Chemistry

A 10.0 L container contains 1.0 L of solution of a gas. Assume [gas]=1.5x10^-4 M in solution when 2 mol of gas remain in gas form. If 1 mol of gas is removed from the gas phase, what will be the new concentration of the gas in solution? What is the value

*asked by Sarah on February 15, 2016* -
## Chemistry-ksp and kb

We were given a 0.1 M KOH solution.25cm3 of that solution is taken and 5g of MX precipitate is added to that.X- is an anion of a strong acid. Kb for MOH=2*(10)^-5 Ksp for MX= 3*(10)^-6 M 1)find the [M+] in the solution 2)Find the [X-] concentration and pH

*asked by Shenaya on May 24, 2017* -
## English to writeteacher

I started writing my essay regarding The Undomestic Goddess. Sometimes its easier to run from your problems than face them they will eventually catch up to you. Samantha Sweeting was a smart articulate lawyer who was hoping to become a partner in her law

*asked by Taunya on January 22, 2007* -
## Improving your writing Revised

For the past three months there seems to be an ever-growing problem at our company of DMD Medical Supplies: The quality of work has been poor; the morale of various employees has been brought down; and the workflow has been uneven amongst both teams and

*asked by Shawna on February 2, 2012* -
## Chemistry

One last question...even though no one seems to be willing to help me out without being rude. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The activity of the sample was 300 µCi.

*asked by Trixie on April 16, 2010* -
## English

i read the book the dark and deadly pool but i have need to kno 3 chraters and 2 conflicts about it THANKX Since you read the book, I'm sure you know three of its characters. Those are the main people in the book. Mary Elizabeth was the main character. Who

*asked by Anonymous on October 6, 2006* -
## Chemistry

To prepare a solution of NaCl, you weigh out 2.634 (0.002)g and dissolve it in a volumetric flask whose volume is 100.00 (0.08) mL. Express the molarity of the solution, along with its uncertainty.

*asked by Taylor on October 2, 2016* -
## chemistry

what volume of a 0.247 M perchloric acid solution is required to neutralize 23.8 mL of a 0.156 M calcium hydroxide solution? _titration problem of acids/bases

*asked by Elise on April 2, 2015* -
## chemistry

50 mL of a 2.50 M solution of ammonium phosphate is added to 100mL of a 1.50 M solution of calcium nitrate. At the end of the reaction 11.2 grams of precipitate produced. What is the percent yield

*asked by Bleh on April 18, 2012* -
## chemistry

8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution? Express your answer with the appropriate units.

*asked by Anonymous on November 7, 2014* -
## CHEM

What is the molarity of a calcium sulfate solution prepared by adding 27.89g of CaSo4 to sufficient water to make a final solution volume of 1.00L?

*asked by Lisa on February 7, 2013* -
## chemistry

If you put 0.25 molar solution of Sodium Chloride (NaCl) in 100 ml of distilled water. ... how much salty precipitate remains in an evaporating dish from 10 ml of solution?

*asked by Bev on January 18, 2016* -
## CHEM

What is the molarity of potassium iodide solution prepared by adding 5.810g of KI to sufficient water to make a final solution volume of 250.0mL?

*asked by Lisa on February 7, 2013* -
## Chem

If a solution containing 88.445 g of mercury(II) perchlorate is allowed to react completely with a solution containing 13.180 g of sodium sulfide, how many grams of solid precipitate will be formed?

*asked by asd on February 1, 2016* -
## Chemistry

A solution of boric acid (H3BO3) in water has a pH of 3.45. If the solution also contained NaHBO3, what do you expect to happen to the pH? Increase Decrease Stay the same Not enough information provided

*asked by apersonyoudontknow on March 20, 2017* -
## Chemistry

An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the molarity

*asked by Jessica on October 1, 2011* -
## chemistry

Please help?! if 600 mL of a 0.04M KCl solution is mixed with 50mL of a 0.03M Na2SO4 solution, will a precipitate be formed? Explain your reasoning and/or show all calculations?

*asked by ryan on February 1, 2015* -
## chemistry

sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?

*asked by katy on November 2, 2009* -
## Chemistry

If a solution containing 107.68 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed?

*asked by Julia on October 11, 2016* -
## Chemistry

You mix 200.0 mL of 0.350 M HCl with a 300.0 mL solution of 0.100 M Ba(OH)2. Calculate the concentration of each ion remaining in the solution after the reaction has reached completion.

*asked by Leslie on September 25, 2013* -
## analytical chemistry

What volume (in liters) of 0.96 M KOH solution should be added to a 0.130 L solution containing 10.2 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 9.90?

*asked by joi on March 27, 2014* -
## chemistry

if 36.23mL of a standard 0.1959M NaOh solution is required to neutralize 25.00mL of H2SO4. what is the Molarity of the acid solution, balance the equation. Please help with calculation. Thank you for your help.

*asked by kate- Please help on September 1, 2012* -
## chemistry

If a solution containing 34.576 g of mercury(II) perchlorate is allowed to react completely with a solution containing 10.872 g of sodium sulfate, how many grams of solid precipitate will be formed?

*asked by lee on April 19, 2013* -
## chemistry

if you dissolve 20mg of alcl3 into 2.0 of a 2.5 molal nacl solution (density 1.08kg/l), what would be the mass concentration (ppm(weight)) of al3+ in the resulting solution?

*asked by Ashley on January 26, 2014* -
## Chemistry

A 25.0mL sample of a 0.100M solution of acetic acid is titrated with a 0.125M solution of NaOH. Calculate the pH of the titration mixture after 10.0, 20.0, and 30.0 mL of base have been added.

*asked by Amanda on November 8, 2010* -
## chem

Assume that 35.0 mL of a 0.13 M solution of a weak base B that accepts one proton is titrated with a 0.13 M solution of the monoprotic strong acid HX. (a) How many moles of HX have been added at the equivalence point?

*asked by hannah on March 24, 2013* -
## chemistry

What volume (in liters) of 0.94 M KOH solution should be added to a 0.090 L solution containing 9.1 g of glutamic acid hydrochloride (Glu, FW=183.59; pka1=2.23, pka2=4.42, pka3=9.95) to get to pH 10.20?

*asked by Decisice 2 on May 23, 2013* -
## Chemistry #4

What is the concentration of a solution formed by dissolving 10.0g of ammonium acetate in enough water to form 150.0mL of solution? Could someone please explain and show me how to do this? I have the answer= .865M But I am not sure exactly how?!

*asked by Chelsea on December 9, 2013* -
## chem

A sample of 45.0 ml of 0.750M AgNO3 solution is added to 65.0ml of 1.375M Cr(NO3)3 solution. Calculate the resultant concentration of nitrate ions in the mixture.

*asked by bec on January 7, 2009* -
## Chemistry

Balance these reactions using the half-reaction method Sn2+ + IO3- -> Sn4= + I- (acidic solution) CrO2 + ClO- -> CrO42- + Cl- (basic solution)

*asked by Mary on May 26, 2010* -
## chemistry

What volume (in liters) of 0.96 M KOH solution should be added to a 0.090 L solution containing 9.9 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 10.20?

*asked by shanonn on May 3, 2013* -
## algebra

solve the following systwm graphically. Be sure to check your solution. if the system has an infinite number of solutions, use set-builder notation to write no solution, state this. 4y=x+8, x=2/3y+2

*asked by jessica on July 9, 2014* -
## chemistry

An aqueous solution contains 0.445 M ethylamine (C2H5NH2). How many mL of 0.226 M hydrochloric acid would have to be added to 150 mL of this solution in order to prepare a buffer with a pH of 10.200

*asked by chem on March 16, 2015* -
## Chem

A 0.2181 g sample of KHP required 17.29 mL of sodium hydroxide solution to reach the phenolphthalein end point. Calculate the molarity(M) of the NaOH solution.

*asked by Donnie on October 9, 2012* -
## chemistry

A scientist wants to make a solution of tribasic sodium phosphate, , for a laboratory experiment. How many grams of will be needed to produce 400 of a solution that has a concentration of ions of 1.20 ?

*asked by Marry on September 29, 2010* -
## Chemistry

Refer to the calibration curve shown in the experiment. If the absorbance of the solution is 0.400, what is the concentration of the iron in that solution? Show or explain how you arrived at your answer.

*asked by Elly on June 20, 2011* -
## chem 1046

Calculate the solubility (in grams per 1.00 102 mL of solution) of magnesium hydroxide in a solution buffered at pH = 9. Enter your answer to 2 significant figures.) Ksp = 2.06e-13

*asked by Anonymous on July 9, 2012* -
## chemistry12_2016-2

14.0 grams of potassium hydroxide was dissolved to form 100 centimetre cubeof an aqueous solution. What was the concentration of this solution in mol/decimetre cube.

*asked by Anonymous666_4 on March 27, 2016* -
## chemistry

the student's lab manual says to mix some of his CaCl2 solution with an aqueous solution of sodium carbonate (Na2CO3). What evidence of a chemical reaction would he expect to see?

*asked by jalisa on December 17, 2012* -
## Chemistry

How many grams of solid KOH must be added to 100ml of a buffer solution which is 0.1M each with respect to the weak acid HA and its potassium salt KA in order to make the pH of the solution 6.0?

*asked by Sandu on October 4, 2016* -
## chemistry

to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g KNO3 I have a hard time determing the M1V1=M2V2 is

*asked by swtnblk on November 6, 2011* -
## chemistry

a 12ml sample of 0.4m silver nitrate solution is mixed with 8 ml of 0.8m sodium chloride solution. determine the identity of precipitate and the number of grams produced.

*asked by Anonymous on May 4, 2015* -
## Chemistry

How many grams of aspirin (C9H8O4) are required to react with exactly 29.40 mL of a 0.02400% w/w solution of sodium hydroxide (NaOH)? What would the consequences be in 0.01200% w/w solution was used instead? Thanks for any help - no idea how to proceed.

*asked by Che on January 18, 2011* -
## Chem II

Find the mass of sodium formate that must be dissolved in 200.00cm^3 of a 1.0M solution of formic acid to prepare a buffer solution with pH=3.40? I have no clue how to work this out. Please help me.

*asked by Bianca on November 19, 2012* -
## Chemistry-Experiment

I did an experiment where I had 5 ml of MgCl2, then 5 ml NH4 solution (NH4OH (aq)) was added and it was observed that a precipitate formed; cloudy solution. After I added 1g of NH4Cl(s), the solution clears up (transparent). 2nd experiment: There was 5ml

*asked by Fresca on March 30, 2012* -
## Chemistry

Under an O2(g) pressure of 1.00 atm , 28.31mL of O2 (g) dissolves in 1.00L H2O at 298K. What will be the molarity of O2 in the saturated solution at 298K when the pressure is 3.86atm ? (Assume that the solution volume remains at 1.00L .) I used PV=nRT and

*asked by Amber on February 22, 2010* -
## Chemistry

Under an O2(g) pressure of 1.00 atm , 28.31mL of O2 (g) dissolves in 1.00L H2O at 298K. What will be the molarity of O2 in the saturated solution at 298K when the pressure is 3.86atm ? (Assume that the solution volume remains at 1.00L .) I used PV=nRT and

*asked by Someone please help. on February 22, 2010* -
## statistics

A professor is interested in determining whether assigning mandatory homework affects students’ grades. He is currently teaching two sections of the same class; in one class, he assigns mandatory homework problems, while in the second class, he just

*asked by matt on October 24, 2014* -
## Chemistry

A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. A. What is the molarity of the iodine solution? B. What is the titer of the iodine solution?

*asked by Ana on May 26, 2011* -
## chemistry

The pH of saturated is found to be 13.12. A 15.0mL sample of saturated Sr(OH)2 is diluted to 250.0mL in a volumetric flask. A 15.0 mL sample of the diluted Sr(OH)2 is transferred to a beaker, and some water is added. The resulting solution requires 27.6mL

*asked by chips ahoy on April 11, 2011* -
## Algebra

-Alfonso can write 100 practice problems for the math team in 20 hours, Beauregard can write the same number of problems in 30 hours, and Clyde can write the number of problems in 40 hours. Working together, at what time will the three of them finish

*asked by Mark on December 5, 2012* -
## chemistry

If you add 50 g of sylvite in 100 ml of water at 60 ° C, the resulting solution will she unsaturated, saturated or supersaturated? You prepare a solution and you add 50 g of potassium nitrate to 100 ml of water at 50 ° C. What type of solution are you

*asked by Kay on February 8, 2011* -
## chem

Equal volume of a 0.02 M Zn+ solution and a 2.0M NH3 solution are mixed. Kf for [Zn(NH3)4] is 4.1*10^8. If enough sodium oxalate is added to make the solution 0.1 M in oxalate, will ZnC2O4 precipitate. Ksp ZnC2O4= 2.7*10^-8. I set up an ICE table which

*asked by Sara on August 10, 2009* -
## PreCalc

Approximate the solutions to the following equation on the interval [0,2π). Round your answer to four decimal places. sinθ=0.65 Apparently, there suppose to be two answers to this question with a comma separating both answers. I know because I've

*asked by chizoba on August 15, 2016* -
## Chemistry

A solution is prepared by dissolving 0.56 grams of benzoic acid (HC6H5CO2, MM = 122.12 g/mol, Ka = 6.4 X 10-5) in enough water to make 1.0 L of solution. Calculate the pH of this solution at equilibrium. 2. Calculate the pH of the system in Question 1 when

*asked by meow on March 26, 2019* -
## Math

How many gallons of 15% iodine solution should be mixed with 40% iodine solution to make 100 gallons of a 20% solution?

*asked by Helen on January 24, 2012* -
## Chemistry

You have a stock solution of 5.0 M H2SO4. How many mL of stock solution are required to make 136 mL of 1.6 M H2SO4 solution

*asked by Linzy on April 8, 2013* -
## Algebra II

What is the solution of the system of equations? {-3x - 4y - 3z = -7 {2x - 6y + 2z = 3 {5x - 2y + 5z = 9 A. (5,-2,7) B. (-5,2,7) C.(5,2,-7) D. No solution Use a matrix to find the solution to the system of equations. {-8x - 8y = -16 {6x - 9y = -108

*asked by HELPME on September 27, 2018* -
## math

log4(x-3)=2 4^2=x-3 16=x-3 19=x Does this mean the solution would be x=19 or no solution? How would I check this to know if 19 is a solution. I know I plug it back in. Like so: log4(19-3)=2 4^2=19-3 16=16 Did i check correctly?

*asked by Anonymous on November 20, 2014* -
## algebra

How many liters of 20% alcohol solution should Maria mix with 50 liters of a 60% alcohol solution to obtain a 30% solution?

*asked by Deja on July 23, 2010* -
## HARD chemistry

A solution of ferrous sulfate (FeSO4) is titrated with a solution of potassium permanganate in sulfuric acid. The balanced half reactions are as follows: 10FeSO4 + 5 H2SO4 --> 5 Fe2(SO4)3 + 10 H ^+ +10e^- and 2 KMnO4 + # H2SO4 +10e^- --> 2 MnO4 + K2SO4 + 8

*asked by Amy on January 4, 2010* -
## chemistry

A solution of ferrous sulfate (FeSO4) is titrated with a solution of potassium permanganate in sulfuric acid. The balanced half reactions are as follows: 10FeSO4 + 5 H2SO4 --> 5 Fe2(SO4)3 + 10 H ^+ +10e^- and 2 KMnO4 + # H2SO4 +10e^- --> 2 MnO4 + K2SO4 + 8

*asked by amy on January 5, 2010* -
## Chemistry

A sample of 0.0020 mole of HCl is sissolved in water t omake a 2000ml solution. Calculate the molarity of the HCl solution, the (H30+) and the pH. For a strong acide such as HCl the (h30+) is the same as the molarity of the HCl solution. HCl +H20 Balanced

*asked by Susie on December 1, 2010* -
## College Chemistry/Lab Math

I think I have this problem figured out correctly, but is there anyone who can tell me if I'm doing something wrong. The question is... "One troy ounce of gold is worth $380. There are 33.8 grams per troy ounce. You have a stock colloidal solution of a

*asked by James on March 17, 2013* -
## Chemistry

1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration? 2. A mixture of 2 volatile liquids is said to be ideal if each component obeys Raoult’s Law: Pi=XiPio

*asked by Michelle on February 4, 2015* -
## 10th grade

An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0°C. (the gram formula mass=85.0 grams per mole) Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make a

*asked by R on December 25, 2009* -
## Analytical chemistry

A solution is created using 2.1700 grams of Calcium Hydroxide (MW is 74.093) in a 1L volumetric flask. A 50 mL aliquot is then taken and aded to a 350 mL volumteric flask and filled to the line. Finally, a 10 aliquot of the that solution is taken and added

*asked by Sam on October 2, 2016* -
## Chemistry

1) How many drops of 12M HCl would you add to 1.00 L of 0.100 M HC2H3O2 to make [C2H3O2-] = 1.0 x 10^-4 M? Assume that 1 drop = 0.050 mL and that the volume of the solution remains 1.00 L after the 12 M HCl is diluted. [Hint: What must be the [H3O+] in the

*asked by Chem on August 10, 2009* -
## Chemistry

a class reacts 50.00ml samples of 0.200 mol/L potassium phosphate solution with an excess of 0.120 mol/L lead(II) nitrate solution. Which reagent is intended to be the limiting reagent, what is he minimum volume of lead II nitrate solution required. How do

*asked by tryme00 on April 1, 2012* -
## CHEMISTRY

A solution of a metal carbonate M2CO3, was prepared by dissolving 7.46 g of the anhydrous solid in water to give 1000cm^3 of solution. 25.0cm^3 of this solution reacted with 27.0cm^3 of 0.100 mol/dm^3 hydrochloric acid. Calculate the relative formula mass

*asked by DAVID on July 9, 2016* -
## Chemistry

A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2

*asked by coug on January 4, 2010* -
## Chemistry

A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2

*asked by coug on January 4, 2010* -
## chemistry

An aqueous solution is analyzed and found to contain potassium ions and sulﬁte ions. Write the equation for the dissolution of the salt that produced this solution. If the solution contains 0.600 mol of potassium ions, how many moles of sulﬁte ions are

*asked by lebanon on February 23, 2014* -
## chemistry

5Fe(2+ charge) + MnO4(-1 charge) +8H(1+ charge) -> 5Fe(3+ charge) + Mn(2+ charge) + 4H2O In a titration experiment based on the equation above, 25ml of an Acidified Fe(2+ charge) solution requires 14 ml of standard .050 M MnO4(1- charge) solution to reach

*asked by corey on October 3, 2007* -
## Chemistry

A saturated solution of lead ii trioxonitrte v was prepared at 22degree Celsius at 27cm3 of this solution required 46cm3 of NaCl solution containing 96gdm3 for complete precipitation. Find the solubility of the lead in trioxonitrte v at 22degree Celsius in

*asked by Mohammed on May 24, 2016* -
## Algebra

Two more Algebra questions : Drawing a blank on this one, not sure where to start. Find the equation, in standard form, with all integer coefficients, of the line perpendicular to x + 3y = 12 and passing through (9, -5). I have half a solution to this one:

*asked by John on October 15, 2007* -
## chemistry

Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which of the following statements are true concerning this solution? (Ka for CH3NH3+ = 2.3 x 10 -11). 1. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffer

*asked by bekah on March 25, 2014* -
## chemistry

I have a 0.25 m aquaeous solution of HCL. It's density is 1.05 g/ml. WHat is the % by mass (m/m) of this solution? What is the molarity of the solution? define molality. m = # mols/kg solvent. We have 0.25 m so we must have 0.25 x 36.5 g/mol HCl = 9.125 g

*asked by nancy on March 20, 2007* -
## science

which is the correct balanced equation for a given titration process, (a) or (b)? a) 6H+ + 2MnO4- + 3H2O2 -> 4O2 + 2Mn2+ + 6H2O b) 6H+ + 2MnO4- + 5H2O2 -> 5O2 + 2Mn2+ + 8H2O Process: Make a solution in a 100mL volumetric flask using 1g of NaBO3*4H2O, 20mL

*asked by sarah on March 30, 2011* -
## astronomy

An Extreme Ultrviolet imager telescope is used to observe the sun and corona.it has four filters which are sensitive to different wavelenghts of UV radiation.These are: filter: 17.1nm 19.5nm 28.4nm 30.4nm Question: which filters are most likely to be of

*asked by amy21 on March 5, 2008* -
## science

If you were riding on a train, which of the following would look as if it is not moving? the conductor walking by you a building you are passing a flying bird

*asked by Anonymous on April 13, 2014* -
## chemistry

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the

*asked by Anonymous on November 16, 2008* -
## chemistry URGENT (1)

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the

*asked by Anonymous on November 16, 2008* -
## Chemistry

1)A solution prepared by adding 0.400 mol of acetic acid (pKa = 4.74) and 0.400 mol of sodium acetate to 100.0 mL of water. The pH of this buffer solution is initially 4.74. Predict the final pH when 55.0 mL of 1.10 M NaOH is added to solution 2) A

*asked by Maya on December 1, 2016* -
## chemistry

If a solution contains 255ml of ethanol in a 375 ml solution, what is the % of ethanol in that solution?

*asked by Twynna on January 28, 2011* -
## chemistry

If a solution contains 255ml of ethanol in a 375 ml solution, what is the % of ethanol in that solution?

*asked by Twynna Andrews on January 26, 2011* -
## chem 215

16.6 ml of a solution is run into an empty flask, from a buret. The mass of the empty flask is 145.0 g. The mass of the flask plus solution is 158.5 g. The density of the solution is _____ g/ml.

*asked by Anonymous on October 7, 2015* -
## Math

A custodian pours1/8 gallon of cleaning solution into each pail of water that she uses. how many pails of water and cleaning solution can the custodian make using 16 gallons of cleaning solution?

*asked by Mel on March 25, 2015* -
## mathematics

The solution below corresponds to an inequality involving a quartic function. Write a possible quartic polynomial inequality that matches the solution. Prove that your inequality matches the solution. x < 4 and x > 7

*asked by mack on January 7, 2018* -
## MATH

The solution below corresponds to an inequality involving a quartic function. Write a possible quartic polynomial inequality that matches the solution. Prove that your inequality matches the solution. x < 4 and x > 7

*asked by ken on January 6, 2018* -
## ~ CHEMISTRY ~

If k is a constant, how will a change in volume change the pressure? Choose one set of numbers. Assign one of them to represent P and the other to represent V. What happens to P if V is assigned the larger number? What happens to P if V is assigned the

*asked by Anonymous on March 25, 2016* -
## Differential Equations

Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t0 [Hint: you need to

*asked by Erica on January 31, 2013*

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