Otu esi agbakọ ntinye uche nke ngwọta
Ngụkọta ngwọta bụ otu n'ime isiokwu kachasị mkpa na kemistri, ma maka ụlọ nyocha ụlọ akwụkwọ, nyocha ụlọ nyocha, yana ngwa ụlọ ọrụ dịka ọgwụ, nri, na ọgwụgwọ mmiri. N'ikwu ya n'ụzọ dị mfe, ntinye uche na-egosi etu solute dị na ọnụọgụ ihe mgbaze ma ọ bụ ngwọta enyere. Ka ntinye uche dị elu, otú ahụ ka solute dị. N'ihi na e nwere ọtụtụ ụzọ isi gosipụta ntinye uche, ịghọta usoro na usoro mgbakọ na mwepụ ga-enyere gị aka ịhọrọ usoro kwesịrị ekwesị maka ọnọdụ gị kpọmkwem.
1. Ghọta Okwu Ndị Dị Mkpa: Ihe Na-agbaze, Ihe Na-agbaze, na Ihe Na-agwọta
Tupu ị banye n'ime mgbakọ na mwepụ ahụ, gbaa mbọ hụ na ị chọpụtara ọdịiche dị n'etiti okwu atọ ndị a:
– Ihe na-agbaze: ihe a na-agbaze, dịka ọmụmaatụ shuga, nnu, ma ọ bụ HCl.
– Ihe mgbaze: ihe na-agbaze, nke na-abụkarị mmiri (H₂O) n'ọtụtụ oge.
– Ngwọta: ngwakọta otu nke ihe mgbaze na ihe mgbaze.
N'ịgbakọ mkpokọta, ihe a na-ejikarị eme ihe bụ ọnụọgụ ihe gbazere agbaze (oke, moles, ma ọ bụ olu) ma e jiri ya tụnyere olu nke ihe ngwọta ahụ ma ọ bụ oke nke ihe ngwọta ahụ.
2. Ụdị Ntinye Uche A Na-ahụkarị
Lee ụfọdụ n'ime nkeji ma ọ bụ ụzọ ndị a na-ejikarị egosipụta ntinye uche:
1. Molarity (M)
2. Molarity (m)
3. Pasentị oke (% w/w)
4. Pasentị olu (% v/v)
5. Pasentị olu oke (% w/v)
6. Akụkụ kwa nde (ppm) na akụkụ kwa ijeri (ppb)
7. Nkịtị (N) (a ka na-eji ya eme ihe n'isiokwu ụfọdụ dịka titration)
Ebe ọ bụ na nke ọ bụla nwere ọnọdụ ojiji nke ya, ịkwesịrị ịma usoro ahụ, data dị mkpa, na otu esi agbanwe ya.
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3. Ịgbakọ Molarity (M)
Molarity na-egosi ọnụọgụ nke moles nke solute kwa lita nke ngwọta.
Usoro:
\[
M = \frac{n}{V}
\]
Ozi:
– \( M \) = molarity (mol/L)
– \( n \) = ọnụọgụgụ nke mole nke solute (mol)
– \( V \) = olu nke ihe ngwọta (L)
Usoro ngụkọ Molarity
1. Gbakọọ ntụpọ nke solute:
\[
n = \frac{m}{M_r}
\]
– \( m \) = oke ihe dị na ya (grams)
– \( M_r \) = oke molar (g/mol)
2. Gbanwee olu nke ngwọta ahụ ka ọ bụrụ lita ma ọ bụrụ na ọ ka dị na mL:
\[
1000 \ederede{ mL} = 1 \ederede{ L}
\]
3. Tinye n'ime usoro molarity.
Ebe:
Gbazee 5,85 g nke NaCl (Mr = 58,5 g/mol) ka ọ bụrụ olu mmiri nke 500 mL. Gbakọọ molarity ahụ.
- Mol NaCl:
\[
n = \ frac{5,85}{58,5} = 0,1 \ederede{mol}
\]
– Olu ngwọta:
\[
500 \ederede{ mL} = 0,5 \ederede{ L}
\]
- Oke nha:
\[
M = \frac{0,1}{0,5} = 0,2 \ederede{ M}
\]
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4. Ịgbakọ Molality (m)
Molarity na-egosi ọnụọgụgụ moles nke solute kwa kilogram nke ihe mgbaze. A na-ejikarị ya eme ihe n'ọmụmụ ihe gbasara ihe ndị na-akpata colligative (ebe esi mmiri, ebe oyi kpọnwụrụ akpọnwụ, nrụgide osmotic) n'ihi na ọ naghị agbanwe okpomọkụ (oke anaghị agbanwe dịka olu).
Usoro:
\[
m = \frac{n}{mass\ solvent\ (kg)}
\]
Ebe:
A na-agbaze gram 10 nke urea (Mr = 60 g/mol) na gram 200 nke mmiri. Gbakọọ molarity ahụ.
- urea urea:
\[
n = \ frac{10}{60} = 0,1667 \ederede{mol}
\]
– Ibu nke ihe mgbaze:
\[
200 \ederede{ g} = 0,2 \ederede{ kg}
\]
- Ụkpụrụ:
\[
m = \frac{0,1667}{0,2} = 0,8335 \ederede{ m}
\]
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5. Ịgbakọ Pasentị Oke (% w/w)
A na-eji pasentị oke eme ihe mgbe ihe mejupụtara nke sitere na oke ibu dị mkpa karị, dịka ọmụmaatụ na ngwakọta siri ike ma ọ bụ ngwọta siri ike.
Usoro:
\[
\% (w/w) = \frac{oke\ nke solute}{oke\ nke ngwọta} \ugboro 100\%
\]
Ebe:
A na-eji gram iri nke nnu na gram iri itoolu nke mmiri eme ihe ngwọta. Pasentị nha nke nnu dị aṅaa?
– Oke nke ihe ngwọta = 10 g + 90 g = 100 g
– Pasentị oke:
\[
\% = \frac{10}{100} \ugboro 100\% = 10\%
\]
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6. Ịgbakọ Pasentị Olu (% v/v)
A na-ejikarị pasentị olu eme ihe maka ngwakọta mmiri mmiri na mmiri mmiri, dịka ọmụmaatụ mmanya dị na mmiri.
Usoro:
\[
\% (v/v) = \frac{olu\ solute\ solute}{olu\ solute} \ugboro 100\%
\]
Ebe:
A na-agwakọta ethanol 30 mL ma gwakọta ya ruo 100 mL. Gịnị bụ % v/v?
\[
\% (v/v) = \frac{30}{100} \ugboro 100\% = 30\%
\]
Ihe dị mkpa: n'ụfọdụ ngwakọta, olu anaghị abụ ihe mgbakwunye zuru oke mgbe niile (n'ihi mbelata olu), mana maka nsogbu ndị bụ isi, a na-ewere ha dị ka ihe mgbakwunye.
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7. Ịgbakọ Pasentị Oke-Mpịakọta (% w/v)
A na-ahụkarị nkeji a na akara ngwọta na bayoloji ma ọ bụ ahụike, dịka ọmụmaatụ "NaCl 0,9% w/v", nke pụtara 0,9 g NaCl kwa 100 mL nke ngwọta.
Usoro:
\[
\% (w/v) = \frac{mass\ (g)}{volume\ solution\ (mL)} \ugboro 100\%
\]
Ebe:
Ọ bụrụ na agbazere gram 2 nke glucose ruo 50 mL, mgbe ahụ:
\[
\% (b/v) = \frac{2}{50} \ugboro 100\% = 4\%
\]
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8. Ịgbakọ ppm na ppb
A na-eji ppm (akụkụ kwa nde) eme ihe maka obere mkpokọta, dịka ọmụmaatụ ọdịnaya nke ihe ndị na-emerụ emerụ na mmiri.
Ọ dị mma maka mmiri mmiri (njupụta ~ 1 g/mL):
– 1 ppm ≈ 1 mg/L
– 1 ppb ≈ 1 µg/L
Ihe atụ ppm:
Ọ bụrụ na e nwere 5 mg nke ihe X na 2 L nke mmiri, ntinye ahụ bụ:
\[
\text{ppm} = \frac{5\ mg}{2\ L} = 2,5\ mg/L \ihe dịka 2,5\ ppm
\]
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9. Mwepụ nke Ngwọta: Usoro M1V1 = M2V2
Ọtụtụ mgbe, ị na-enwe ihe ngwọta ngwaahịa a chịkọtara ma chọọ ịgwakọta ya. Na mgbaze, ọnụọgụgụ nke ihe ngwọta ahụ na-anọgide otu tupu na mgbe mgbaze ahụ gasịrị (ọ bụrụhaala na enweghị mmeghachi omume).
Usoro mgbaze:
\[
M_1V_1 = M_2V_2
\]
Ozi:
– \( M_1 \) = ntinye uche mbụ
– \(V_1 \) = olu ewepụtara site na ngwọta mbụ
– \( M_2 \) = ntinye uche ikpeazụ
– \( V_2 \) = olu ikpeazụ nke ihe ngwọta ahụ mgbe a gwakọtara ya
Ebe:
Ị nwere HCl 2 M ma ịchọrọ ime 250 mL nke HCl 0,5 M. Kedu olu HCl 2 M dị mkpa?
\[
V_1 = \frac{M_2 V_2}{M_1} = \frac{0,5 \ugboro 250}{2} = 62,5\ mL
\]
Ya bụ, were 62,5 mL nke mmiri 2 M, wee tinye mmiri na mkpokọta olu nke 250 mL.
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10. Ndụmọdụ iji hụ na mgbakọta nke itinye uche abụghị ihe ọjọọ
1. Lezienụ anya na nkeji ndị a: a ga-agbanwe mL ka ọ bụrụ L maka molarity; g ka ọ bụrụ kg maka molarity.
2. Kewaa ọdịiche dị n'etiti "ihe mgbaze" na "ngwọta": molarity na-eji olu nke ngwọta ahụ, molarity na-eji oke nke ihe mgbaze ahụ.
3. Jiri oke molar ziri ezi: lelee usoro kemịkalụ na ọnụọgụ atọm.
4. Echefula mkpokọta oke/olu nke ihe ngwọta ahụ: maka pasentị, ihe denominator bụ oke/olu nke ihe ngwọta ahụ, ọ bụghị ihe mgbaze ahụ.
5. Dee usoro na nkeji dị iche iche n'ọkwa ọ bụla: nke a bụ ụzọ kachasị mma isi gbochie mmejọ.
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Mmechi
Ịgbakọ mkpokọta nke ngwọta adịghị ike ma ọ bụrụ na ị ghọtara ụdị mkpokọta ejiri na data dị. Molarity dabara adaba maka mgbakọ na mwepụ dabere na mmeghachi omume na ụlọ nyocha, molarity dị mma maka ihe ndị metụtara colligative, a na-ejikarị oke/ọnụọgụ pasent na ụlọ ọrụ mmepụta ihe na ahụike, ebe a na-eji ppm/ppb maka obere mkpokọta. Site n'ịmụta usoro ndị bụ isi dịka \( M = n/V \), molarity, pasent, na dilution \( M_1V_1 = M_2V_2 \), ị nwere ike idozi nsogbu ntinye dị iche iche ngwa ngwa na nke ziri ezi.
Ọ bụrụ na ịchọrọ, m nwekwara ike ịmepụta mpempe akwụkwọ ngwa ngwa (mpempe akwụkwọ aghụghọ) ma ọ bụ ajụjụ omume yana nkọwa.
