戇戇居士

pH calculations - please help?

Find pH and concentration?

A solution contains 1.0 × 10–2 M Pb2+. Drops of a 5.0 × 10–1 M solution of NaBr were added through a microburet?

25.0 mL of a 0.10 M solution of KOH is added to 15.0 mL of 0.15 M solution of HCl. What is the pOH of the resulting solution?

35.0 mL of 0.13 M weak acid (Ka = 6.3 x 10^-5) is titrated with 0.15 M NaOH. What is the pH at the half-equivalence point?

I have a trigonometry problem?

is 1.5 ml greater than or less than 1500 l?

When an appropriate ligand is added to a saturated solution of an insoluble salt, a complex ion forms and mulitple choice below?

trig. precalc. word problem?

Dynamite (C3H5N3O9) explodes to form a mixture of gasses.?

help me with this maths question (fractions)?

Collision theory question.. help?

Calculate concentrations of the major species present in a buffer solution prepared by adding 1.4 grams of NaOH to 140ml of 0.750 M NH4Cl?

4sin (x)=3cos (×) =>cos (x)=?

is calcium hydroxide is acidic,alkaline or neutral?

geometric sequence problem 2?

A body moves from point A to point B with a velocity of 5m/s and returns to point A with a speed of 3m/s what is the average velocity?

Can someone help me with Chemistry concentration question?

CHEM HELP!!! why do most ionic compounds have such high melting and boiling points?

What is the mass in grams of a sample of water when the temperature drops from 75.00∘C to 56.00∘C and 800.0 J of energy are lost?

How many moles are in 6.84g of Fe2O3?

calculate the mass of KOH to be dissolved in 250cm3 of solution to give pH of 9.given molar mass of KOH=56.1?

CHEM!! You put a 75 g ice cube at 0 C into a glass of water at 25 C. The final temp is 12.5 C. How much water was there initially? Explain?

Calculate the number of atoms of oxygen in 93 grams of so3.?

Which has the largest ionization energy ? F+ or Ne? And, which has a greater atomic radius? Cl + or Cl +2?

Can someone help me with chemistry, solubility questions? Thank u?

Hydrocarbon Chemistry?

For the reaction 2Na+2H2o—>2NaOH+H2 how many Grams of sodium hydroxide are produced from 3.0 moles of water?

Hydrated sodium sulfate has a chemical formula of Na2SO4∙ 10H2O.What is the chemical formula of the anhydrous form of the same compound?

C10 H16(l)+8Cl (g)→10C(s)+16HCl(g) Suppose a chemist runs this reaction and makes569 g of carbon. How many grams of turpentine were consumed?

2Na (s) + 2 H2O (l) → 2NaOH (aq) + H2 (g) If 4.52 moles of Na react with an excess of water, how many grams of H2 are formed?

Chemistry question?

The oxidation state of chrome which threatens to cause cancer is: a. Cr (0) b. Cr (III) c. Cr (V) Cr (VI)?

The Celsius temperature of a 1.73 L sample of gas is lowered from 80.0°C to 37.0°C. What will be the resulting volume of this gas?

A force of 10N extends a spring by 3cm. What will be the extension if a mass of 0.3kg is attached to the lower end of the spring?

A 25.00 mL sample of NaOH is titrated with 17.13 mL of 0.3150 M sulfuric acid. What is the concentration of the NaOH solution?

on of 2s2o3^2-?

what is the oxidation number of S in 2S2O3^2-?

What is the external temperature of the liquid nitrogen tank?

solve for x? solving two step equations?

A rectangular floor is 21 feet long and 12 feet wide what is the area of the floor in square yards ?

PLEASE HELP EASY CHEMISTRY QUESTION?

Is this MgCl2, KCl, or K2SO4?

Ag+ + Br- <-----> AgBr Equilibrium problem chemistry help?

802 mL of aluminum hydroxide is exactly neutralized with 628 mL 0.320 M sulfurous acid solution. What is the concentration of the base?

what is the molar concentration of 356.0 mL on and aquaeous H2CO3 solution the required 55.33 mL of 577.0 mM standart solution of NAOH?

802mL of aluminum hydroxide is exactly neutralized with 628 mL 0.320 M sulfurous acid solution. What is the concentration of the base?

Give the electron configuration of carbon, using the spdf, noble gas, and orbital box notations?

When the Pd-106 nucleus is struck with an alpha particle, a proton is produced along with a new element. What is this new element?

Help finding half life?