Is this the correct answer?

Mixing Strong Acids with Strong Bases What is the pH of the solution that results from mixing 8.00 mL of 0.030 M perchloric acid

garik1379 [7]

Answer: PH= 1.4

Explanation:

n(mole)= concentration(c)× volume(v)

n(HClO4) = 0.08 ×0.03

n(HClO4)= 0.0024 mole

n(Ba(OH)2) = 0.28 × 0.05

n(Ba(OH)2) = 0.014

2HClO4 + Ba(OH)2.....>Ba(ClO4)2 + 2H2O.

Hence, the limiting reagent is perchloric acid. According to the reaction:

0.0024 HClO4 req 1/2× 0.0024 of Ba(OH)2.

n(Ba(OH) reacted= 0.0012

Excess n(Ba(OH)2) = 0.014-0.0012

Excess n(Ba(OH)2) = 0.0128

Conc(Ba(OH)2) unreacted = 0.0128/.32 (vol. of mix is 32ml)

= 0.04M = [H+]

PH = -log[0.04] = 1.397

PH= 1.4

6 0

3 years ago

How many grams of Cl are in 535 g of CaCl₂?

Sliva [168]

The answer is 341.7 g.

(1) Calculate the molar mass (M) of CaCl2 which is the sum of atomic masses (A) of elements:
M(CaCl2) = A(Ca) + 2A(Cl)
A(Ca) = 40.1 g/mol
A(Cl) = 35.45 g/mol

M(CaCl2) = 40.1 + 2 * 35.45 = 40.1 + 70.9 = 111 g/mol

(2) Calculate in how many moles are 535 g:
M(CaCl2) = 111 g/mol
111g : 1mol = 535 g : xmol
x = 535 g * 1mol : 111g = 4.82 mol

(3) Calculate how many grams of Cl are in 4.82 mol:
A(Cl) = 35.45 g/mol
2A(Cl) = 2 * 35.45 = 70.9 g/mol
70.9 g : 1 mol = x : 4.82 mol
x = 70.9 g * 4.82 mol : 1 mol = 341.7 g

7 0

3 years ago

Glaciers are agents of deposition and erosion. When we talk about glacial erosion, we consider both the erosion processes and th

const2013 [10]

I think it is B

Explained answer:
Glaciers dissolve and melt because they are made out of ice

7 0

3 years ago

Phenazopyridine is used to treat what

expeople1 [14]

Phenazopyridine is used to treat pain, burning, increased urination, and increased urge to urinate. These symptoms are usually caused by infection, injury, surgery, catheter, or other conditions that irritate the lower urinary tract.

8 0

3 years ago

Read 2 more answers

An unknown substance:- has a melting point of 1127 C,- is soluble in water,- does not conduct heat as a solid, andis hard.Given

Nat2105 [25]

Answer:

The unknown substance is CoF2

Explanation:

Diamond is insoluble in water. It does not conduct electricity. Every atom in a diamond is bonded to its neighbours by four strong covalent bonds, leaving no free electrons and no ions .

Most diamonds are extremely efficient thermal conductors, but electrical insulators. Diamond conducts heat well as a result of the strong covalent bonds between carbon atoms in a diamond crystal.

The melting point of diamond is about 4027 °C.

Since the melting point of diamond is way higher, it's not soluble in water and diamond does conduct heat. The unknown substance is not diamond.

SF6 is slightly soluble in water.

SF6 is not hard but it's a gas.

The melting point of SF6 is about -64 °C

Since SF6 is a gas and not a solid and has a melting point way lower than the unknown substance; the unknown substance is not SF6

Aluminum is an excellent heat and electricity conducto

The melting point of Al is 660 °C

Since Al has a lower melting point and is a good heat conductor; the unknown substance is not aluminium.

CoF2 is sparingly soluble in water.

CoF2 has a melting point between 1100 °C and 1200 °C

CoF2 is a solid but a bad heat conductor

⇒ The unknown substance is CoF2

3 0

3 years ago