Ions Definition and 332 Threads

Just a quick question about error analysis. Moles of Calcium ions in 10 mL = 6.0 x 10-4 ± 0.5 x 10^-5 mols I'm suppose to scale this number to Moles of Calcium ions in 250mL. So when I multiply by 25, do I multiply the error value as well? Or does it remain the same?

I'm not sure where this question belongs, maybe in chemistry? move it if necessary. so the quest is this I have a salt crystal lamp. it is a large block of salt on a wood base with a light bulb inside a hollow in the salt. the selling point of these lamps is that the heat from the...

I often read about how electrolyte conduct electricity, the websites I searched often explain only in terms of mobile ions are able to move freely in the solution, therefore they could carry charges throughout the solution bla bla bla. However, none of them explain how does that help conduct...

Hi, I came across this statement and an explanation to this is greatly appreciated as I can't figure this out. "pH 0 means ~ 2 moles of H3O+ for each 100 moles water" ? Thank you.

1. How are ions formed from atoms? Attempt at Solution: From reading books and browsing on the internet I've collected a good amount of information, but I don't completely understand them. "An ion is formed when an atom gains or loses an electron in bonding with another atom, causing the...

Please provide me Diffusion coefficients of following ions in water at different temparatures (25 deg celcius, 75, 125, 300 etc) 1. Fe2+ 2. H2O 3. Fe(OH)+ 4. Fe(OH)2(aq) 5. H+ 6. OH- 7. CO3-2 8. H2CO3 9. HCO3- 10. Na+ 11. Cl-...

Hi all, We use often concentrations in chemical/biological experiments. It is expressed usually in mili/µ mole/cm3 or mm3 Is there a way to know the number of ions contained in a volume? Is there a way to know the number of ions (or density) on a surface knowing the concentration...

Homework Statement Firstly, I have done the bulk of the lab but me and my lab partner cannot determine somethings and we are confused! - Calculating the mmole of Ca2+ ion present in each sample titration In titration #1 the beaker contained 1.00ml .15 M CaCl2 stock solution (with EDTA...

"A Copper test is performed much as you would test for chlorine residue. A level of copper in the range of 0.15 through 0.20 ppM" The above is an extract from a page on swimming pool ionisers. The ionisers produce copper ions for water cleaning purposes. 0.2ppM (parts per Million) - I...

I thought this is a pretty easy problem and I can't believe I did it wrong. What did I do wrong? How many moles of ions are present in 250mL of 4.4 M solution of sodium sulfate? Here what I did: 250 mL = .25 L mol Na2(SO)4 = MV = 4.4 * .25 = 1.1 mol but the answer was 3.3 mol

How would I write the configuration for ions? Would I alter the last subshell (e.g. 1s2 2s2 2p6 3s2 3p6 4s2 3d10: I change 3d10) or the shell with the n and l (1s2 2s2 2p6 3s2 3p6 4s2 3d10: I change 4s2)? Thanks.

Homework Statement Hydrogen-like ions consist of one electron and a nucleus of a charge Ze (Z - the number of protons in the nucleus and e - the charge of an electron). The Bohr model of a hydrogen-like ion states that the single electron can exist only in certain allowed orbits around the...

This is my reaction Pb(NO3)2(aq) + H2SO4(aq) → PbSO4(s) + HNO3(aq) Pb + (NO3)2(aq) + H2 + SO4(aq) → PbSO4(s) + H + NO3(aq) So far I've done that, and now I'm stuck I see h2 and h and NO3 2 molecules and on the left side i see only one NO3 molecule on the right, can I cross out both or do i...

Homework Statement Pb(NO3)2(aq) + H2SO4(aq) → PbSO3(s) + HNO3(aq) Pb + (NO3)2(aq) + H2 + SO4(aq) → PbSO3(s) + H + NO3(aq) The Attempt at a Solution So far I've done that, and now I'm stuck I see h2 and h can I cross out both or do i have to balance right now? My teacher said you can...

I am trying to find the lowest concentration of hydrogen ions out of the following: 0.1 M HCl 0.1 M NaOH 0.1 M H2SO4 pure water I am having a hard time with the book and this...Thanks

Homework Statement I have discovered that in order to suceed in Chemistry, one must learn the polyatomic Ions. My instructor said the best way is to just memorize them, but here is the thing. Ok I can memorize that peroxide is O2, but memorizing the charges is kicking my behind. I was...

You are asked to consult for the city's research hospital, where a group of doctors is investigating the bombardment of cancer tumors with high-energy ions. The ions are fired directly toward the center of the tumor at speeds of 5.50 times 10^6. To cover the entire tumor area, the ions are...

[SOLVED] Electric Force Question The distance between neighboring singly charged sodium and chloride ions in crystals of table salt (NaCl) is 2.82 x 10^-10 m. What is the attractive electric force between the ions? By coulomb’s law, Electric force F = [1/4πεo] q1 q2/ r^2 = 9.0 x...

[SOLVED] Current in a solution of NaCl ions. Homework Statement Current passes through a solution of sodium chloride. In 1.00 second, 2.68*10^16 Na+ ions arrive at the negative electrode and 3.92*10^16 Cl- ions arrive at the positive electrode. A) What is the current passing between the...

or are they 1/8 of a sphere at the corners and 1/4 of a sphere at the edge?

[SOLVED] Amount in mol of compound ions This is just a quick question as it has slipped my mind.. Does anyone know how you would find the mol of a compound ion (ie - SO42- (sulfate ion)), if you are given the mol of the whole compound (in my case it is K2SO4) I know to find single ions...

How would I go about deriving the cooridinate numbers of both ions in rock salt, and, how could I account for the differences in lattice enthalpy between the following; LiCl (861 kJ/mole) - NaCl (787) LiCl - LiF (1046) LiCl - MgO (3850) Cheers.

Emission line is unique for all elements and i think it depends on the electrons of the elements...my doubt is if an element gains or loses one electron then would the emission line of this ionised atom and the emission line of its neighbor atom in the periodic table is same or not..since the...

[SOLVED] Iron ions I am curious about the properties of iron ions fe2+ and fe3+. As they are accelerated in a mass spectrometer, which would travel faster and have the largest radius. I understand that they have lost electrons and have a marginal loss in mass, as well I understand that a...

Homework Statement I'm having trouble with naming complex ions. My textbook has given me a few rules but the examples they give seem to contradict them. These are all the rules I know, can someone tell me if they are right and if I am missing any? Homework Equations Start naming with...

Homework Statement Hydrogen peroxide decomposes into water and oxygen gas with the help of a catalyst. write the molecular formula and the redox half reactions. Homework Equations (N/A) The Attempt at a Solution the molec. formula is of course 2 H_{2}O_{2} (l)...

Hi there! Could anyone help me out with this question? Which steps should I take in solving this question? Chemical cells can produce quite large charge flows for substantial times before their chemicals have all reacted. If zinc is the metal losing electrons under chemical attack, what mass...

Homework Statement How do i combine 2 different ions to make an ionic compound Homework Equations Na+¹ + O-² ---> The Attempt at a Solution I have no idea what to do plus I am new to this forum. Please try to help me in the simplest way possible because my teacher has failed...

Homework Statement Assuming equal masses, how would the detection times of 3H+ and 3He+ compare [as they're both accelerated toward a detector in the direction of a constant E field]? A) 3H+ would have a longer flight time than 3He+. B) 3H+ would have a shorter flight time than...

If plasma is a collection of positive ions and electrons, why don't they recombine together and become neutral?

can you tell me how an ion of an element can be formed? For example- how does an ion of sodium form?

Homework Statement Among the complex ions formed by Co^{3+} match each ion to its color. 1 [Co(CN)_{6}]^{3-} 2 [Co(NH_{3})_{6}]^{3+} 3 [CoF_{6}]^{3-} 4 [Co(H_{2}O)_{6}]^{3+} A Blue B Green C Pale Yellow D yellow-orange The Attempt at a Solution I found the ligands for each mode. 1 CN- 2...

Homework Statement Sodium ions (Na+) move at 0.851 m/s through a bloodstream in the arm of a person standing near a large magnet. The magnetic field has a strength of 0.254 T and makes an angle of 51 degrees with the motion of sodium ions. The arm contains 100 cm^3 of blood with 3 x 10^20 Na+...

Pb2+, La3+, Ti4+, O2- I am very grateful for your help!

Someone once said that a positive hydrogen ion in a solution is not just a proton. When queried he replied by explaining that a positive hydrogen ion in solution will have a relatively high charge density because of the small ionic radius. I can't see any difference: a proton and a positive...

In a paragraph in the textbook "When CSIRO scientists were called into investigate, they discovered that the cause was the oxidation of iron pyrites in these area, much of which had been exposed as a result of draining swamps for grazing cattle and the use of floodgates to drain cane fields...

What is the most common chemical method for removing H_30^+ ions in aqueous solution? Write a net ionic equation which describes this method.

I am unsure how to do this question : Will acidified potassium manganate (VII) oxidise hydrogen sulphide to sulphur in aqueous solution? Will bromine oxidise iron (II) ions in aq solution ? Will iodine " " " " " " " ? any ideas

Hello, I am not sure how I should do this exercise, and I would appreciate some pointers... We have 6 flasks, each with a 7 ml solution in it diluted to 100 mn with distilled water (I don't think the content is relevant to the question, but if you need to know what chemicals were used...

are these correct? i always get confused with the rules for the end of the order: N^3- >> [Ne] Tl^3+ >> [Xe]4f14 3d10 Fe^3+ >> [Ar]3d5

Here is the question: A uniform electric field of magnitude 604 N/C exists between two parallel plates that are 3.66 cm apart. A proton is released from the positive plate at the same instant that an electron is released from the negative plate. Determine the distance from the positive plate...

how to test the component inside oxygen absorber in food?? we guess that there may be iron(II) or iron(III) ion. we use reducing agent or oxidzing agent to test it ? however, if both of them exist in the oxygen absorber, how can we distinguish them?? :confused:

Here is what I have: BrO_{3}^{-} + NH_{3}OH^{+} + H_{2}O --> Br^{-} + NO_{3}^{-} + 2H_{3}O^{+} I'm adding back spectator ions, K+ and Cl-. KBrO_{3} + NH_{3}OHCl + H_{2}O --> KBr + KNO_{3} + 2H_{3}O^{+} + HCl As you can see I have 1 K and 1 Cl on the left, but 2 K and 1 Cl on the right. And...

How many moles and numbers of ions of each type are present in the following aqueous solutions? 3.26 L of a solution containing 6.96 x 10^21 formula units of lithium nitrate per liter I got 1.16e-2 mols of Li and NO3 as well as 6.99e21 ions for each. The software I am using (webassign) says...

what is the intention of atom to form ions? how do we know when iron form iron2+ or iron3+ irons? do we need to remember the electrochemical series?

write an equation for the reaction of Al2O3 with hydroxide ions. Al2O3 + OH^-1 ----> ?

Sorry if this is a ridiculously simple problem, but I don't get it. The professor didn't give examples of how to do this and it's been years since I've taken science courses. I have to determine the electric force (Coulomb's Law) on the K+ ion due to the Cl- ion 9E-10m away. How do you...

Anyone has a nice, neat and complete ions table? I haven't found one yet. ---- Edit: Sorry, I have just found one. But if someone has a good sugestion do not hesitate.

I'm working on a number of problems that tells me to write the structure of the alkyloxonium ion produced after an alcohol is protonated by a strong acid it says that if the alkyloxonium ion is capable of losing water readily, write the structure of the resulting carbocation and if the...

In terms of electronic structure, Fe3+ is more stable than Fe2+ because it has a half filled d-orbital which gives extra stability. i.e. Fe3+ : [Ar]3d5 Fe2+ : [Ar]3d6 But the standard electrode potential of the following reaction is 0.77V, Fe3+(aq) + e- => Fe2+(aq) which means...