a density of 1.0 M solution of NaCL
29,471 results, page 80

Chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this reaction? 2.) what is the ... 
Chemistry
A 0.750 g sample of an unknown solid is dissolved in 100 mL of water and acidfied with 25 mL of 3 M H2SO4 then titrated with a 0.0200 M KMnO4 solution. If the unknown solid requires 12.5 mL of the KMnO4 solution to reach the endpoint, what is the % sodium oxalate in the ... 
Biology
6. Consider an experiment in which starch is dissolved in a liter of water. Some of the solution is placed into a securely tied dialysis bag. The dialysis bag is placed into a beaker containing distilled water and iodine for 30 minutes. What are the correct answers for the ... 
Organic Chemistry
The solubility of compound A in ethanol is 0.5 g per 100 mL at 0oC and 5.0 g per 100 mL at 78oC. (a) To make a hot, saturated solution of 15.0 g of A at 78oC, how much ethanol is required? (b) When the solution prepared in is cooled to 0oC, how much of compound A will be ... 
science
A student prepared a .10M solution of acidic acid. Acidic acid has a Ka of 1.75 x 103. What are the hydronium ion concentration and the PH of the solution? I think the PH is 1.76 because I hit log(1.75 x 103) on my calculator and that's what I got thanks in advance for your... 
science
Is a gelatin dessert a solution, a suspension or a colloid? I think it is a suspension. Thanks you. The ingredients of gelatin are completely soluble in water and the end product is clear and transparent. It is a solution, in my opinion. 
Chem II
A 0.10 M HF solution is 8.4% ionized. Calculate the H^+ ion concentration. Here is my line of thought. For every mole HF disolved yeilds one mole of H^+. Since there is ).10 M HF, and the solution is 8.4% ionized = 0.84 M. Is this correct? 
Chemistry
You have a 12 M solution of hydrochloric acid. How many milliliters of this solution will give 25.0 mL of 2.0 M hydrochloric acid when diluted? Where to start, and Where to end. The process of figuring this problem would be greatly appreciated. 
organic chemistry
A solution of acetic acid (CH3COOH; Ka = 1.74 x 105) was titrated to a final pH of 4.76 by using NaOH solution. What % of acetic acid is converted to sodium acetate (CH3COONa+)? Show your method 
chemistry
Calculate the solubility (in grams per 100 mL of solution) of magnesium hydroxide in a solution buffered at pH = 12. I can get the answer in grams per mole, but i am having difficulty changing it to g/100ml. 
math
Explain, in complete sentences, how you would use the graphing method to solve the following system of equations. Provide the solution to the system and explain what the solution represents on the graph. x + 4y = –16 3x + 2y = 12 
Chemistry
Given a solution of ammonium chloride. What additional reagent or reagents are added to prepare a buffer from the ammonium chloride solution? I know the answer is NaOH but I don't know why. Can someone explain this to me please? 
Chem
a blue solution of copper(II) sulfate is mixed with a colerless solution of sodium phosphate and a blue percipitate is formed. Using solubility rules predict the formula of the percipitate 
chemistry
Determine the of mole of water molecules in one mole of a sample of an iron containing (nh4)2so4. FeSO4. nH2O. titrate a solution of the iron containg (solution Y) 
Chemistry
An aqueous solution that 2.10 M in AgNO3 is slowly added from a buret to an aqueous solution that is 1.20×10^−2 M in Cl and 0.260 M in I . When the second ion begins to precipitate, what is the remaining concentration of the first ion? 
Chemistry
An aqueous solution of HCl has a high electrical conductivity when compared to the compound in hexane, whilst the conductivity of a solution of the compound in diethyl ether has an intermediate value. Explain. 
science
When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium acetate solution in order to bring its pH to the target value of 5.00. 
chemistry
1.00 of an aqueous solution contains 1.52g of a compound used in antifreeze. If the osmotic pressure of this solution at 20.0 degree C is 448 torr, calculate the molar mass of the antifreeze compound 
Chemistry
how would you do this question when i did it i did log(1.0) but that is just 0 so what it the procedure to do this question Calculate the pH of a 1.0 mol/L aqueous solution of sodium benzoate. Note: Only the benzoate ion affects the pH of the solution. 
Chemistyr
A 55.29g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.) 
Chemistry
A 55.29g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.) 
chemistry
2. A solution of I2 was standardized with ascorbic acid. Using a 0.1000g 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? 
Utlwanang Barolong secondary school
physical science it is found that 40 ml of a 0.5mol.dm^3 sodium hydroxide solution is needed to neutralise 20mol of the vinegar. calculate the pH of the sodium hydroxide solution 
Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)>2 NaNO3(aq)+CO2(g)+H20(l) 
Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)>2 NaNO3(aq)+CO2(g)+H20(l) 
Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)>2 NaNO3(aq)+CO2(g)+H20(l) 
Algebra 2
What are the real and complex solutions of the polynomial equation? 27x^3 + 125 = 0 I already got the real solution x = 5/3, I just need to figure out how to find the complex solution. Any help? 
Chemistry,please help
You are working with the following equilibrium system in which one chromium complex is blue and one chromium complex is purple. The system is at equilibrium and is currently blue. Predict how the color will change if aqueous Ag+ ions are added. Ag+ reacts with NH3 to form a ... 
Chemistry
Rearrange the titration calculation to find Mb in a solution. If I put 13.2 mL of NaOH and 0.3 mL of phenolphthalein in 25 mL of KHP, what is the Mb of the solution? The original solution of NaOh is 100 mL and is composed of 1.069e15 moles of H+, 9.445e2 moles of OH, and 9.... 
chemistry
Online chemistry lab preparing standards help? I was told to prepare some standard for a chemistry lab and here where the instructions: Obtain a solution of known phosphate concentration. In this lab we will use (1.e002M) potassium dihydrogen phosphate, KH2PO4. Note the ... 
science
Calculate the final concentrations in mol/L of H+, Na+, Cl and SO42 when the following three solutions are mixed together: 1000 cm3 of 0.10 mol dm3 HCl 500 cm3 of 0.20 mol dm3 NaCl 500 cm3 of 0.20 mol dm3 of Na2SO4 
General Chemistry
Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3. This conjugate acid/base... 
Chemistry
You wish to prepare 0.18 M HNO3 from a stock solution of nitric acid that is 18.9 M. How many milliliters of the stock solution do you require to make up 1.00 L of 0.18 M HNO3? 
Chemistry
How many moles of HNO3 are required to make 250mL of a 2.4M solution? How many grams of KOH are required to make 125mL of a .50M solution? 
Chemistry
Calculate the cell potential for the electrochemical cell consisting of Ag metal in a 0.500 M AgNO3 solution and Fe metal in a 3.0 M Fe(NO3)3 solution. 
chemistry
I fyou had only 12g of KOH remaining in a bottle, how many ml of 12.8%(w/v) solution could you prepare? (in mL) How many ml of 0.29 M solution could you prepare using 12 g of KOH? 
Math
Solve triangle ABC if b = 10, c = 9.1, and C = 53.6 degrees. How many solutions are there? First Solution:What are angle A and B and Side a. Second Solution: What are angle A and B and Side a. Thanks! 
Chemistry
.050 mole of weak acid (HA) is dissolved in enough water to make 1.0 L of solution. The pH of this solution is 3.50. What is the value of Ka for this weak acid? 
calculus
verify that y=c/x^2 is a general solution of the differential equation y'+(2/x) y=06y=0 then find a particular solution of the differential equation that satisfies the side condition y(1)=2 
chemistry
A 0.27 sample of a weak acid with an unknown was combined with 12.0 of 3.00 and the resulting solution was diluted to 1.500 . The measured of the solution was 3.95. What is the of the weak acid? 
chem
What volume of a 2.5 M stock solution of acetic acid (HC¿HÀO¿) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution? 
chemistry
What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution? 
Chemistry
About 13% of the acid in a 0.10M solution of a weak acid dissociates to form ions. What is the H3O+ concentration? What is the OH concentration? What is the pH of the solution? 
Pharmacy Math
How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____ 
Pharmacy Math
How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____ 
hum 111
How does the process of refining a solution for a problem differ from the process of refining a solution for an issue? Which do you think is more challenging? 
chemistry
starting with a 30% (W/W) SOLUTION OF HYDROGEN PEROXIDE, how many mL would you need to dilute on order to end up with 25.00ml of a 3.6M hydrogen peroxide solution? 
chemistry
a)Calculate the pH of a solution of 0.75 M HNO3, which is a strong acid. b)Calculate the pH of a 1.0 L aqueous solution made from 0.80 mol CH3COOH and 0.20 mol KCH3COO (Ka = 1.8 x 10^5). 
chemistry
What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution? 
chemistry
What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution? 
Chemistry
10 mL of 0.1 HCl was added to 9mL of water. 10 mL of that solution was added to another 90 mL of water. The student diluted the sample as above 1 time(s). What is the pH of the solution? 
chemistry
A titration of 15.75mL HCL of an unknown molarity requires 20.35mL of 0.0903M NaOH solution. What is the molarity of the HCl solution? 
chem
If 5wt% of silver nitrate solution is required, determine how many grams of silver nitrate is need for an aqueous solution of 100ml. 
chemistry
Precipitation of Ni2+ from a 25 mL aliquot of a solution of unknown concentration yielded 0.338 g of Ni(DMGH)2. Calculate the concentration of the Ni2+ solution 
science
will silver nitrate solution mixed with calcium sulfate solution produce white precipitation? Will it be because formation of silver sulfate? 
math
A salt solution of 15 litres contains 20%salt. How much water must you add to salt solution, in order to dilute it 15% salt? 
Chemistry
A solution of a weak acid (.025M, 200ml) is mixed with a solution of NaOH ( 0.015M, 150ml). The equilibrium pH is 5.51. What is the Ka of the weak acid? 
Chemistry
The mole fraction of zinc chloride, ZnCl2, in an aqueous solution is 5.73×102 . The percent by mass of zinc chloride in the solution is___%. 
College Algebra
How much water must be evaporated from 32 ounces of a 7% salt solution to make a 8% salt solution? (Answer is in ounces) 
Homework Help: Solar Energy Please HelpASAP
d) In the upconvertor 1, two photons are converted into one photon with 100% conversion efficiency. If all photons with energy above that of the band gap of aSiC:H are absorbed in the aSiC:H layer, in which spectral range can the photons be upconverted so that they ... 
My Math
ecide whether each equation has one solution, no solutions, or infinitely many solutions. 1. 2(x – 3) = 2x (1 point) one solution no solutions infinitely many solutions 2. 3(y – 3) = 2y – 9 + y (1 point) one solution no solutions infinitely many solutions 3. 10x – 2... 
Chemistry
A volume of 40.0 of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 20.2 of 1.50M H2SO4 was needed? The equation is 2KOH(aq)+H2SO4(aq)>K2SO4(aq)+2H2O(l) 
chemistry
what is the molarity of a solution of KNO3(molecular mass=101) that contains 404 grams of KNO3 in 2.00 liters of solution? A. 1.00M b. 2.00M c. 0.500M d. 4.00M The definition of molarity is #mols/Liter of solution. Convert 404 g KNO3 to mols (mols = g/molar mass) and plug into... 
chemistry
Given the thermochemical equation below, calculate the amount of energy released when 250. g of NaOH (molar mass = 40.0 g/mol) reacts with an excess of HCl. Report answer to the correct number of significant figures in units of kilojoules, kJ. NaOH + HCl > NaCl + H2O ... 
science
An excess of aluminum metal is added to 200.0 mL of 0.025 M solution of CuCl2, reducing the Cu+2 ions to metallic Cu. If the temperature of the solution increases from 25.0 to 27.5 degrees celsius, what is the enthalpy of this reaction per mole of Cu formed? (Specific heat of ... 
ASAP+LAST CHEM QUESTION+PLEASE HELP!
Hi, I am asked to do this: 12. A buffer solution containing HBO32 –(aq) and BO33 –(aq) ions is used to standardize pH meters in the range pH > 7. Write net ionic equations for the reactions that occur in the buffer solution for the following conditions. a. 
Math
Solve the system of equations using the addition (elimination) method. If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is "no solution" or "infinitely many solutions" and state how you arrived at that conclusion. 3x... 
Chemistry
A 500.0mL sodium iodide (NaI) solution was prepared by dissolving 37.7g of solid NaI in water. Chlorine gas was bubbled through a 100.0mL sample of this solution until the reaction was complete. How many grams of molecular iodine were produced? 
math (please help, test tmrw)
Determine a possible linear function f(x) such that x^2x2 < f(x)< x^3x^22x has a solution and state the solution.(the < are supposed to have lines under that indicate less than/equal to) I just don't really get what it's asking. So I factored each equation and ... 
Math  check my answers :)
1. Find the amplitude, if it exists, and the period of y=tan 1/4È Answer: No limits in amplitude, y=tanÈ/4 period is 4pi 2.Solve x = Arctan(sqrt3) Work: Pythagorean theorem: sqrt(1^2+3)= sqrt4=2 in length. Triangle is 1, sqrt 3,2 Answer: 60° 3. In triangleABC, A = 35°, a... 
chemistry
Nicotine is not only bad for you (ahem!), but it also acts as a base in aqueous solution: Kb = 7x107 at 298K. i) Find G per mol of nicotine acting as a base in aqueous solution at 298K. ii) Find the pH of the solution if the initial [nicotine] = 0.80 M. iii) Without ... 
Chemistryhelp
Hi, I have a question on Gas Chromatography(GC). The following were injected into the GC system:  1) 1% sample solution in acetone 2) a 500 times dilution of item 1) The retention time of the main peak in the diluted sample solution 2) shifted by ~ 2min. The expected area ... 
chemistry
1.92g sample of hydrogen peroxide solution generates 37.8mL O2 at 759 torr and 35 C. What is the percent strength of the peroxide solution? how would you solve this problem and which equations would you use? 
algebra
Find the real solutions 8x^2 + y^2 = 25 8X^2  y^2 = 39 Is this no solution because I tried solving it and i got the square root of 32 for y, but when i plugged it in to get x there was a negative under the square root sign which means its no solution, right? please help...... 
matrices
Let A be a 5 by 4 matris and suppose that the system Ax=b has a solution. Explain why the solution is unique if and only if the rank of A is 4. I said that it is unique becaue the rank is equal to the number of columns. Do you have a better explaination. 
Chemistry
Phenol (abbreviated HOPh) is a weak acid with a Ka= 1.29 X 10^10. What is the pH of a mixture made by mixing 100.0 ml of a 0.700 M solution of phenol with 70.0 ml of a 1.00 M solution of NaOH? Help please and please show work... I'm so confused. 
Chemistry
A 6.00 M H2SO4 solution has d = 1.34 g/mL. What is the mass percent of H2SO4 in this solution? Choose one answer. a. 56.1 b. 43.9 c. 37.0 d. 58.8 When we calculated yesterday the answer was not B. 43.9....I got it wrong and don't know why if the math was correct and I followed... 
Chemistry
A solution is prepared that has [NH3]=1.00M and [Cl]=0.100M. How many grams of AgNO3 can be dissolved in 1.00L of this solution without a precipitate of AgCl(s) forming? Ksp of AgCl = 1.8x10^10 Kf of [(Ag(NH3)2)+] = 1.6x10^7 
Chemistry
Help needed on a homework problem  solution of HCN and CN , Ka 6.2x10^10 . Is this a buffered solution? Shouldn't the pH be greater than 7, and [OH] >[H]? Does adding a strong acid have more effect than adding a strong base? Thanks. 
chemistry
Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe how you would prepare this solution. Include any calculations that you would perform. 
Chemistry
A 15.5 mL sample of 0.215 M KOH solution requires 21.2 mL of acetic acid in a titration experiment. Calculate the molarity of the acetic acid solution. Please show all steps, I don't understand this. 
Chemistry
2MnO4(aq) +5 H2O2 (aq) + 6H+(aq) > 5 O2(g) + 2 (Mn2+(aq) = 8H2O (l) If a 25.00 ml sample of hydro peroxide required 25.25 ml of .353 M KMNo4 solution to react with all the hydrogen perozide what was the molarity of the hydrogen peroxide solution? 
Chemistry
determine the pH of a solution made by mixing 8 ml of 1.10M acetic acid and 2ml 0.9 M sodium acetate solution. pKa for acetic acid CH3COOH is 4.745. Can someone please explain 
Shawn
How many milliliters of 0.355 M NaF solution are needed to react completely with 24.6 mL of 0.216 M CaCl2 solution? How many grams of CaF2 will be formed? The reaction is CaCl2(aq) + 2NaF(aq) → CaF2(s) + 2NaCl(aq) 
chemistry(rusting)
Why metal(eg. iron)placed at aqueous solution will be more easily occur rusting?Is it due to the mobile ions in the aqueous solution ?Please give me an detail explanation ,thank you. 
Biochemistry
HELP!! Describe how to prepare 800 ml of a 0.100 M potassium acetate buffer, pH = 4.46 (n.b. pKacetic acid = 4.76). You have glacial acetic acid (17.6 M), a 1.000 M solution of KOH and a 1.000 M solution of HCl. 
goechemistryscience
i ppted out iron(111) form a solution and weighed the ppt. then dissolved the ppt in a solution and run in an aas and get the concentration. how can i get the percentage concentration of fe3+ given that it is from fe(oh)3 
Chemistry
An aqueous solution contains 0.216 M ascorbic acid (H2C6H6O6) and 0.131 M hydrochloric acid. Calculate the ascorbate (C6H6O62) ion concentration in this solution. [C6H6O62] =______________ mol/L. 
chemistry
A student wishes to prepare 1.000 g of silver chromate. How many mL of .05000M silver nitrate solution should be added to 50.00 mL of .0700M potassium chromate solution assuming 100% yield 
chemistry
8.58g of coastic soada was dissolved to produce a solution of 500cm3 .to neutralize 50cm3 of this solution 15cm3 of 0.4M HCl was consumed .(coastic soada = Na2CO3.XH2O ) find the value of X? 
science
The enthalpy of solution of KBr in water is about +198 kJ/mol. Nevertheless, the solubility of KBr in water is relatively high. Why does the solution process occur even though it is endothermic 
chemistry
I. 1) Calculate the pH of the following solution: 0.1 M HF + 0.2 M NaCN Given: pKa for: HF/F = 3.2 HCN/CN= 9.4 2) Calculate the pH of the solution that results upon mixing 20.0 mL of 0.2000 M HCI with 25.0 mL of: a) distilled water c) 0.13 MNaOH e) 0.23 MNaOH b) 0.13 M AgN03 
chemistry
If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place? 
Chemistry
Frances wanted to prepare a 0.0285M standard solution of LiCl. She weighed out 27.5g of solid LiCl. She had plenty of water available. What volume of the solution was she able to prepare? 
Chemistry
8 g of sulphur is burnt to form SO2 which is oxidized by Cl2 water The solution is treated with BaCl2 solution The amount of BaSO4 precipitated is A/ I mole B/ 0.5 mole C/ 0.24 mole D/. 0.25 mole Which option is correct?? 
Chemistry
a solution of arsenic oxide containing 0.24g required 50cm^3 of acidified potassium manganate of solution of concentration 0.02M for complete oxidation. What is the oxidation state of arsenic in the product? 
chemistry
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 720 mL of solution. What is the pH of this buffer? Ka = 6.2 × 10−6 for HA. Answer in units of pH. please i need the answerf 
Math
Solve the inequality. Expression solution set using interval notation and graph the solution set using a number line. 15x+3<_3(4x7) Thats supposed to be a greater than or equal to sign 
chemistry
A solution containing 29.00 mg of an unknown protein per 22.0 mL solution was found to have an osmotic pressure of 3.10 torr at 18 ∘C. What is the molar mass of the protein? (3.10 torr* 22mL)=.682 I do not know what to do next 
physics
A laser beam passes from air into a 25% glucose solution at an incident angle of 37 ∘ . In what direction does light travel in the glucose solution? Assume the index of refraction of air is n = 1.