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Pengukuran PH Larutan

Oleh:

Rosita Qori L 140341603337

Siti Ma'rifah 140341601740Thesa Ihtiar D 140341505862

!"ita De#$ 140341605176

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Pengertian PH Larutan

%& aalah era(at )easa*a" $a"+

i+!"a)a" !"t!) *e"$ata)a" ti"+)at

)easa*a" ata! )e,asaa" $a"+ i*ili)i

oleh s!at! lar!ta" $a"+ i!)!r e"+a"

s)ala 0 sa*-ai e"+a" 14.

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Pengertian Larutan Penyangga

Lar!ta" -e"$a"++a /,!ffer sol!tio" aalah lar!ta"$a"+ *e*-!"$ai -& $a"+ sa"+at sta,il. i)a s!at!asa* ata! ,asa ita*,ah)a" -aa lar!ta" -e"$a"++a*a)a -& tia) ,er!,ah seara si+"ifi)a".De"+a" aralai" *e"a*,ah)a" air )e ala* ata! *e"+!a-)a" airari lar!ta" -& (!+a tia) *e"+!,ah -& lar!ta" ,!ffer.

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Indikator pH

I"i)ator aalah atat $a"+ *e"!"(!))a"

i"i)asi ,er,ea ala* lar!ta" asa* ,asa a"

"etral. ara *e"e"t!)a" se"$a#a ,ersifat

asa* ,asa ata! "etral a-at *e"++!"a)a")ertas la)*!s a" lar!ta" i"i)ator ata!

i"i)ator ala*i.

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1. ertas La)*!sar"a )ertas

la)*!s ala* lar!ta"asa* lar!ta" ,asaa" lar!ta" ,ersifat"etral ,er,ea. 9a

!a *aa* )ertasla)*!s $ait!:

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Macam Kertas Lakmus

a. La)*!s *erah

La)*!s *erah ala* lar!ta" asa*,er#ar"a *erah a" ala* lar!ta" ,asa,er#ar"a ,ir!.

,. La)*!s ,ir!

La)*!s ,ir! ala* lar!ta" asa* ,er#ar"a*erah a" ala* lar!ta" ,asa ,er#ar"a ,ir!.

. La)*!s *erah *a!-!" ,ir! ala* lar!ta""etral tia) ,er!,ah #ar"a

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,. Lar!ta" I"i)atoro"toh ari lar!ta" i"i)atoraalah:

lar!ta" *etil (i"++a /Metil Ora"+e; MO

%aa -& )!ra"+ ari 6lar!ta" i"i ,er#ar"a (i"++asea"+)a" -aa -& le,ih ari 7#ar"a"$a *e"(ai )!"i"+.

i"i)ator fe"olftali"/%he"ol-htalei" ; --

-& i ,a#ah 8 fe"olftali"tia) ,er#ar"a a" a)a",er#ar"a *erah a"++!r a-a,ila-& lar!ta" i atas 10.

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3. I"i)ator 9la*i

: ar"a )!lit *a"++is aalah!"+! /ala* )eaaa" "etral.i)a e)stra) )!lit *a"++isi,a+i !a a" *asi"+*asi"+

itetes)a" lar!ta" asa* a",asa *a)a ala* lar!ta"asa* ter(ai -er!,aha" #ar"aari !"+! *e"(ai o)elat)e*eraha". Lar!ta" ,asa$a"+ itetes)a" a)a"*e"+!,ah #ar"a ari !"+!*e"(ai ,ir! )ehita*a".

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Macam-macam alat pengukur PH

1. %& *eter

%& Meter aalah (e"is

alat !)!r !"t!)

*e"+!)!r era(at)easa*a" ata!

)e,asaa" s!at!

aira"

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Prinsip Kerja pH Meter

%e"++!"aa" -h *eter !)!- seerha"a $ait!e"+a" ara iel!-)a" -aa lar!ta" $a"+ a)a"i!(i *a)a -aa -& *eter a)a" *!"!l a"+)a

s)ala $a"+ *e"!"(!))a" -& lar!ta".

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Kalibrasi dan Penggunaan pH

Meter

Se,el!* *ela)!)a" -e"+!)!ra" -& *eterhar!s i)lai,rais !"t!) *e"a-at)a" hasil-e"+!)!ra" $a"+ te-at )ali,aris i"i al!)!)a"

setia- -e"+!)!ra". ?"t!) -e"++!"aa" "or*al)ali,rasi har!s ila)!)a" -aa a#al setia- hari.

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2. I"i)ator ?"i@ersalI"i)ator !"i@ersal

*er!-a)a" a*-!ra"ari ,er*aa**aa* i"i)ator $a"+a-at *e"!"(!))a"-& s!at! lar!ta" ari-er!,aha" #ar"a"$a.I"i)ator !"i@ersalaa !a *aa* $ait!i"i)ator $a"+ ,er!-a)ertas a" lar!ta".

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Menghindari kesalahan

Pengukuran pH1. Teliti a" fo)!s -aa saat *ela)!)a"

-e"+!)!ra".

2. Me"++!"a)a" alat !)!r ses!ai e"+a"

%ri"si- er(a alat $a"+ i+!"a)a".

3. Mela)!)a" ali,rasi -aa alat setia- )ali

selesai *e"++!"a)a" alat.

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