What is the balanced equation for H3PO4=H4P2O7+H2O

Which compound in each pair is more soluble in water?(a) Magnesium hydroxide or nickel(II) hydroxide

Alexxandr [17]

What is called compound?

In chemistry, a compound is a substance made up of two or more different chemical elements combined in a fixed ratio.
When the elements come together, they react with each other and form chemical bonds that are difficult to break.
These bonds form as a result of sharing or exchanging electrons between atoms.

a) Mg(OH)2 or Ni(OH)2.

Mg(OH)2 1.8×10–11

Ni(OH)2 2.0×10–15

Clearly, Ksp value for Mg(OH)2 is higher , meaning it is MUCH MORE SOLBULE than Nickel

therefore, choose Mg(OH)2.

b)

PbS 3×10–28

CuS 6×10–37

Clearly, PbS is much more soluble than CuS

since Ksp is higher .

c)

Ag2SO4 1.4×10–5

MgF2 3.7×10–8

Clearly, Ag2SO4 has higher Ksp, so it is much more soluble.

Learn more about compound

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6 0

1 year ago

Is hand washing a chemicals change or physicals change and why?

PolarNik [594]

Answer:

If you wash your hands with soap, the soap molecules act as a link between the water you're washing with and the oil on your skin.

Explanation:

4 0

2 years ago

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For the reaction 2 Al + 3 H2SO4⟶ 3 H2 + H2(SO4)3 how many grams of sulfuric acid, H2SO4, are needed to react completely with 53.

shtirl [24]

Answer:

292.4 g

Explanation:

2Al + 3H₂SO₄ → 3H₂ + Al₂(SO₄)₃

First we convert 53.7 g of Al into moles, using its molar mass:

53.7 g ÷ 27 g/mol = 1.99 mol Al

Then we convert Al moles into H₂SO₄ moles, using the stoichiometric coefficients:

1.99 mol Al * $\frac{3molH_2SO_4}{2molAl}$ = 2.98 mol H₂SO₄

Finally we convert 2.98 moles of sulfuric acid into grams, using its molar mass:

2.98 mol H₂SO₄ * 98 g/mol = 292.4 g

4 0

2 years ago

You have 3.50 l of solution that contains 90.0 g of sodium chloride, nacl. what is the molar mass of nacl? what is the molarity

nadya68 [22]

M(NaCl) = Ar(Na) + Ar(Cl) · g/mol.
M(NaCl) = 22,99 + 35,45 · g/mol.
M(NaCl) = 58,44 g/mol.
V(NaCl) = 3,5 L.
m(NaCl) = 90 g.
n(NaCl) = m(NaCl) ÷ M(NaCl).
n(NaCl) = 90 g ÷ 58,44 g/mol.
n(NaCl) = 1,54 mol.
c(NaCl) = n(NaCl) ÷ V(NaCl).
c(NaCl) = 1,54 mol ÷ 3,5 L.
c(NaCl) = 0,44 mol/l = 0,44 M.

3 0

2 years ago

tert-Butyl alcohol is a solvent with a Kf of 9.10 ∘C/m and a freezing point of 25.5 ∘C. When 0.807 g of an unknown colorless liq

mylen [45]

Answer: ethylene glycol (molar mass = 62.07 g/mol)

Explanation:

Depression in freezing point :

Formula used for lowering in freezing point is,

$\Delta T_f=k_f\times m$