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indikator Asam Basa

Telah disebutkan bahwa asam telah mempunyai rasa asam, sedangkan basa telah mempunyai rasa pahit. Namun begitu, tidak dianjurkan untuk dapat mengenali asam dan basa dengan, cara mencicipinya, sebab banyak diantaranya yang dapat merusak kulit (korosif) atau bahkan bersifat racun. Asam dan basa juga dapat dikenali dengan menggunakan zat indikator, yaitu zat yang telah meniberi warna berbeda dahlia) lingkungan asam dan lingkungan basa (zat yang warnanya dapat berubah saat berinteraksi atau bereaksi dengan senyawa asam maupun senyawa basa).

Dalam laboratorium kimia, indikator asam-basa yang biasa di gunakan adalah indikator buatan dan indikator alami, Berikut ini penjelasan tentang indikator asam-basa buatan dan indikator asam-basa alami.
Derajat keasaman (pH)

Indikator Tingkat Keasaman Suatu zat asam yang di masukkan ke dalam air akan dapat mengakibatkan bertambahnya ion hidrogen (H+) dalam air dan berkurangnya ion hidroksida (OH- ). Sedangkan pada basa, akan dapat terjadi sebaliknya. Zat basa yang dimasukkan ke dalam air akan dapat mengakibatkan bertambahnya ion hidroksida (OH- ) dan berkurangnya ion hidrogen (H+).

Jumlah ion H+ dan OH- di dalam air dapat di gunakan untuk dapat menentukan derajat keasaman atau kebasaan suatu zat. Semakin asam suatu zat, semakin banyak ion H+ dan semakin sedikit jumlah ion OH- di dalam air. Sebaliknya semakin basa suatu zat, semakin sedikit jumlah ion H+ dan semakin banyak ion OH- di dalam air.
Proses netralisasi

Apabila suatu larutan asam dengan larutan basa akan dicampurkan dalam suatu bejana, maka ion H+ (dari asam) akan bereaksi dengan ion OH- (dari 311 basa) membentuk air. Reaksi antara ion H+ dengan OH- tersebut juga dapat di tuliskan sebagai berikut. H+ + OH- air

ini karena selain air, basil reaksi antara asam dan basa adalah suatu zat yang bersifat netral, yaitu zat yang tidak bersifat asam maupun basa. Zat netral yang di maksudkan di sini adalah garam. Mengingat reaksi netralisasi juga dapat menghasilkan garam, maka reaksi ini juga di kenal dengan istilah reaksi penggaraman. Secara sederhana, reaksi netralisasi atau reaksi penggaraman juga dapat di tuliskan sebagai berikut.

Contoh sederhana dari reaksi penggaraman adalah reaksi antara asam klorida (HC1) dengan natrium hidroksida (NaOH), yang akan dapat membentuk natrium klorida NaCl (garam dapur) dan air. Pada dasarnya, reaksi penggaraman (netralisasi) juga sangat berguna bagi kehidupan manusia.

Reaksi netralisasi tidak hanya terbatas pada pembentukkan garam dan air. Dalam kehidupan sehari-hari banyak dijumpai prinsip atau reaksi netralisasi, termasuk dalam bidang kesehatan dan pertanian. Perhatikan contoh berikut ini : gas-gas sisa, baik yang berasal dari kendaraan bermotor atau pabrik, mengandung gas belerang dioksida dan nitrogen oksida.

Gas-gas ini akan dilepas ke udara sehingga menimbulkan polusi. Gas-gas tersebut juga akan larut dalam titik-titik air di awan sehingga membentuk larutan asam sulfat dan asam nitrat. Ketika terjadi hujan, larutan-larutan ini akan bercampur dan turun bersama hujan. Inilah yang dinamakan dengan hujan asam.

Hujan asam sangat merugikan manusia dan lingkungan. Berikut adalah dampak yang ditimbulkan oleh hujan asam:

    Hujan asam dapat menyebabkan matinya tumbuhan dan ikan. Asam yang telah terdapat dalam air hujan juga dapat bereaksi dengan mineral dalam tanah. Tumbuhan akan menjadi kekurangan mineral sehingga mati atau tidak tumbuh dengan baik. Hujan asam juga dapat melarutkan aluminium dari mineral dalam tanah dan bebatuan, kemudian menghanyutkannya ke sungai sehingga dapat meracuni ikan dan mahluk air lainnya.
    Hujan asam yang bereaksi dengan logam juga dapat merusak jembatan, mobil, kapal laut, dan rangka bangunan. Hujan asam juga dapat merusak bangunan (gedung/ rumah) yang terbuat dari batu kapur.


Editor : Dian Sukmawati

INDIKATOR ASAM BASA

GREENWICH, Conn. — Mago is in the bedroom. You can go in.

The big man lies on a hospital bed with his bare feet scraping its bottom rail. His head is propped on a scarlet pillow, the left temple dented, the right side paralyzed. His dark hair is kept just long enough to conceal the scars.

The occasional sounds he makes are understood only by his wife, but he still has that punctuating left hand. In slow motion, the fingers curl and close. A thumbs-up greeting.

Hello, Mago.

This is Magomed Abdusalamov, 34, also known as the Russian Tyson, also known as Mago. He is a former heavyweight boxer who scored four knockouts and 14 technical knockouts in his first 18 professional fights. He preferred to stand between rounds. Sitting conveyed weakness.

But Mago lost his 19th fight, his big chance, at the packed Theater at Madison Square Garden in November 2013. His 19th decision, and his last.

Now here he is, in a small bedroom in a working-class neighborhood in Greenwich, in a modest house his family rents cheap from a devoted friend. The air-pressure machine for his mattress hums like an expectant crowd.

 

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Mike Perez, left, and Magomed Abdusalamov during the fight in which Abdusalamov was injured. Credit Joe Camporeale/USA Today Sports, via Reuters

 

Today is like any other day, except for those days when he is hurried in crisis to the hospital. Every three hours during the night, his slight wife, Bakanay, 28, has risen to turn his 6-foot-3 body — 210 pounds of dead weight. It has to be done. Infections of the gaping bedsore above his tailbone have nearly killed him.

Then, with the help of a young caretaker, Baka has gotten two of their daughters off to elementary school and settled down the toddler. Yes, Mago and Baka are blessed with all girls, but they had also hoped for a son someday.

They feed Mago as they clean him; it’s easier that way. For breakfast, which comes with a side of crushed antiseizure pills, he likes oatmeal with a squirt of Hershey’s chocolate syrup. But even oatmeal must be puréed and fed to him by spoon.

He opens his mouth to indicate more, the way a baby does. But his paralysis has made everything a choking hazard. His water needs a stirring of powdered food thickener, and still he chokes — eh-eh-eh — as he tries to cough up what will not go down.

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Mago used to drink only water. No alcohol. Not even soda. A sip of juice would be as far as he dared. Now even water betrays him.

With the caretaker’s help, Baka uses a washcloth and soap to clean his body and shampoo his hair. How handsome still, she has thought. Sometimes, in the night, she leaves the bedroom to watch old videos, just to hear again his voice in the fullness of life. She cries, wipes her eyes and returns, feigning happiness. Mago must never see her sad.

 

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 Abdusalamov's hand being massaged. Credit Ángel Franco/The New York Times

 

When Baka finishes, Mago is cleanshaven and fresh down to his trimmed and filed toenails. “I want him to look good,” she says.

Theirs was an arranged Muslim marriage in Makhachkala, in the Russian republic of Dagestan. He was 23, she was 18 and their future hinged on boxing. Sometimes they would shadowbox in love, her David to his Goliath. You are so strong, he would tell her.

His father once told him he could either be a bandit or an athlete, but if he chose banditry, “I will kill you.” This paternal advice, Mago later told The Ventura County Reporter, “made it a very easy decision for me.”

Mago won against mediocre competition, in Moscow and Hollywood, Fla., in Las Vegas and Johnstown, Pa. He was knocked down only once, and even then, it surprised more than hurt. He scored a technical knockout in the next round.

It all led up to this: the undercard at the Garden, Mike Perez vs. Magomed Abdusalamov, 10 rounds, on HBO. A win, he believed, would improve his chances of taking on the heavyweight champion Wladimir Klitschko, who sat in the crowd of 4,600 with his fiancée, the actress Hayden Panettiere, watching.

Wearing black-and-red trunks and a green mouth guard, Mago went to work. But in the first round, a hard forearm to his left cheek rocked him. At the bell, he returned to his corner, and this time, he sat down. “I think it’s broken,” he repeatedly said in Russian.

 

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Bakanay Abdusalamova, Abdusalamov's wife, and her injured husband and a masseur in the background. Credit Ángel Franco/The New York Times

 

Maybe at that point, somebody — the referee, the ringside doctors, his handlers — should have stopped the fight, under a guiding principle: better one punch too early than one punch too late. But the bloody trade of blows continued into the seventh, eighth, ninth, a hand and orbital bone broken, his face transforming.

Meanwhile, in the family’s apartment in Miami, Baka forced herself to watch the broadcast. She could see it in his swollen eyes. Something was off.

After the final round, Perez raised his tattooed arms in victory, and Mago wandered off in a fog. He had taken 312 punches in about 40 minutes, for a purse of $40,000.

 

 

In the locker room, doctors sutured a cut above Mago’s left eye and tested his cognitive abilities. He did not do well. The ambulance that waits in expectation at every fight was not summoned by boxing officials.

Blood was pooling in Mago’s cranial cavity as he left the Garden. He vomited on the pavement while his handlers flagged a taxi to St. Luke’s-Roosevelt Hospital. There, doctors induced a coma and removed part of his skull to drain fluids and ease the swelling.

Then came the stroke.

 

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A championship belt belonging to Abdusalamov and a card from one of his daughters. Credit Ángel Franco/The New York Times

 

It is lunchtime now, and the aroma of puréed beef and potatoes lingers. So do the questions.

How will Mago and Baka pay the $2 million in medical bills they owe? What if their friend can no longer offer them this home? Will they win their lawsuits against the five ringside doctors, the referee, and a New York State boxing inspector? What about Mago’s future care?

Most of all: Is this it?

A napkin rests on Mago’s chest. As another spoonful of mush approaches, he opens his mouth, half-swallows, chokes, and coughs until it clears. Eh-eh-eh. Sometimes he turns bluish, but Baka never shows fear. Always happy for Mago.

Some days he is wheeled out for physical therapy or speech therapy. Today, two massage therapists come to knead his half-limp body like a pair of skilled corner men.

Soon, Mago will doze. Then his three daughters, ages 2, 6 and 9, will descend upon him to talk of their day. Not long ago, the oldest lugged his championship belt to school for a proud show-and-tell moment. Her classmates were amazed at the weight of it.

Then, tonight, there will be more puréed food and pulverized medication, more coughing, and more tender care from his wife, before sleep comes.

Goodbye, Mago.

He half-smiles, raises his one good hand, and forms a fist.

Meet Mago, Former Heavyweight

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