Thus, the question would probably ask if the ring of gold is actually pure gold. For this, first there is a need to calculate the specific heat capacity of the calorimeter. If this equivalent to the specific heat for pure gold, then the gold ring is pure fold.
Qwater = mCdt = (50 g) × (4.18 J/gC) (31 - 23.7) = 1525.7 J
On the basis of conservation of energy,
Qwater = Qcalorimeter = mCdT = 1525.7
1525.7 = (10.5) (C) (78.3 - 31)
C = 3.072 J/gC
As the specific heat of the calorimeter is not equivalent to that of the pure gold (0.1291 J/gC), then the gold ring is not pure.
Answer:
The pH is 7.54
Explanation:
The Henderson - Hasselbalch equation states that for a buffer solution which consists of a weak acid and its conjugate base, the buffer pH is given by:
pH
pkₐ is for the acid
In this case, the buffer hypochlorous acid HClO is a weak acid, and its conjugate base is the hypochlorite anion ClO⁻ is delivered to the solution via sodium hypochlorite NaClO
.
NaCIO = 0.200 M
HCIO = 0.200 M
pkₐ = -log₁₀ kₐ = -log₁₀ (2.9 × 10⁻⁸) = 7.54
∴pH = = 7.54
I am going to say it is false.
Answer:
Polyatomic Ionic Compound
Explanation:
In given statement the compound given is called as Sodium oleate this means that when Oleic acid is treated with NaOH then it forms.
In chemistry there are few species which are involved in the formation of compounds.
(i) Atoms:
It is very common that atoms of different elements combine to form compound through covalent bond. For example, H₂, O₂, N₂, F₂ e.t.c.
(i) Ions:
Other than covalent compounds we have ionic compounds. Ionic compounds are made up of ions. These ions forming the ionic compounds can be monatomic like Na⁺, Br⁻, Mg²⁺, Al³⁺, N⁻³ or they can be polyatomic like CO₃²⁻, SO₄²⁻, NH₄⁺, PO₄³⁻ e.t.c.
(iii) Polyatomic Ions:
In polyatomic ions we find a charge on a molecule which contains two or more atoms bonded covalently. Hence, in given compound we have a long chain of molecule containing a negative charge neutralized by opposite +ve charged sodium ion. Hence, Sodium oleate is a polyatomic ionic compound.
p waves (primary waves)
the fastest and can travel through solids, liquids, or gasses